Remove bitmap drawables and let Android Studio generate the at buildtime

Tested on virtual Android 8.1, 5.0 and an API Level 14. 14 showed some visual glitches (Some minor parts of the icons are black) - But i think it's a good trade-off. Everything still works.

app/src/main/res/drawable/ic_add_blue_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#0082C9" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF0082C9" android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

app/src/main/res/drawable/ic_add_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FFFFFFFF" android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

app/src/main/res/drawable/ic_delete_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FFFFFFFF" android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector>

app/src/main/res/drawable/ic_delete_white_32dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="32dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="32dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FFFFFFFF" android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector>

app/src/main/res/layout/activity_notes_list_view.xml

@@ -39,7 +39,7 @@
     <android.support.design.widget.FloatingActionButton
         android:id="@+id/fab_create"
         style="@style/fab"
-        android:src="@drawable/ic_action_new"
+        android:src="@drawable/ic_add_white_24dp"
         app:backgroundTint="@color/primary"
         app:rippleColor="@color/primary_dark" />
 </android.support.design.widget.CoordinatorLayout>

app/src/main/res/layout/fragment_notes_list_note_item.xml

@@ -6,23 +6,23 @@
 
     <ImageView
         android:id="@+id/noteDeleteLeft"
-        android:layout_width="32dp"
-        android:layout_height="32dp"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
         android:layout_gravity="center_vertical"
         android:layout_marginLeft="@dimen/button_padding"
         android:layout_marginStart="@dimen/button_padding"
         android:contentDescription="@string/menu_delete"
-        android:src="@drawable/ic_action_delete" />
+        android:src="@drawable/ic_delete_white_32dp" />
 
     <ImageView
         android:id="@+id/noteDeleteRight"
-        android:layout_width="32dp"
-        android:layout_height="32dp"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
         android:layout_gravity="end|center_vertical"
         android:layout_marginEnd="@dimen/button_padding"
         android:layout_marginRight="@dimen/button_padding"
         android:contentDescription="@string/menu_delete"
-        android:src="@drawable/ic_action_delete" />
+        android:src="@drawable/ic_delete_white_32dp" />
 
     <android.support.v7.widget.LinearLayoutCompat
         android:id="@+id/noteSwipeable"

app/src/main/res/layout/widget_note_list.xml

@@ -46,7 +46,7 @@
             android:id="@+id/widget_note_list_create_icon"
             android:layout_width="@dimen/widget_note_list_icon_width"
             android:layout_height="match_parent"
-            android:src="@drawable/ic_action_new"
+            android:src="@drawable/ic_add_white_24dp"
             android:layout_alignParentRight="true"
             android:layout_alignParentEnd="true"
             android:paddingStart="@dimen/widget_note_list_inner_padding"

app/src/main/res/menu/menu_list_context_multiple.xml

@@ -4,7 +4,7 @@
 
     <item
         android:id="@+id/menu_delete"
-        android:icon="@drawable/ic_action_delete"
+        android:icon="@drawable/ic_delete_white_24dp"
         android:orderInCategory="100"
         android:title="@string/menu_delete"
         app:showAsAction="ifRoom" />

app/src/main/res/menu/menu_list_context_single.xml

@@ -16,7 +16,7 @@
         app:showAsAction="ifRoom" />
     <item
         android:id="@+id/menu_delete"
-        android:icon="@drawable/ic_action_delete"
+        android:icon="@drawable/ic_delete_white_24dp"
         android:orderInCategory="100"
         android:title="@string/menu_delete"
         app:showAsAction="ifRoom" />

app/src/main/res/menu/menu_note_fragment.xml

@@ -28,7 +28,7 @@
         app:showAsAction="never" />
     <item
         android:id="@+id/menu_delete"
-        android:icon="@drawable/ic_action_delete"
+        android:icon="@drawable/ic_delete_white_24dp"
         android:orderInCategory="120"
         android:title="@string/menu_delete"
         app:showAsAction="never" />

app/src/main/res/xml/shortcuts.xml

@@ -3,7 +3,7 @@
     <shortcut
         android:shortcutId="it.niedermann.owncloud.notes"
         android:enabled="true"
-        android:icon="@drawable/ic_action_new_theme"
+        android:icon="@drawable/ic_add_blue_24dp"
         android:shortcutShortLabel="@string/action_create"
         android:shortcutLongLabel="@string/shortcut_create_long">
         <intent