- client: Fix client Access settings normalization

Close #1820

Squashed commit of the following:

commit 5aadec2e6e126588313ff006d6f95223ba19a526
Merge: a4db6b42 95f41285
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Wed Jul 15 11:15:31 2020 +0300

    Merge branch 'master' into fix/1820

commit a4db6b42ab9cbf43d96c783a72a99e0a2c594108
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Tue Jul 14 19:08:09 2020 +0300

    Remove textarea comma splitting

commit bb34797aac6602b405941dbd90fe6a81b663bb92
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Tue Jul 14 18:21:18 2020 +0300

    Fix client Access settings normalization

commit ac4fb536514f54c5722077d78dbbd981c4e906a8
Merge: 0c758ddc b9fca8d0
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Tue Jul 14 18:14:38 2020 +0300

    Merge branch 'master' into fix/1820

commit 0c758ddcd738136b92e6f947a8068ecc59f7ec25
Merge: 15650db3 f5a1f311
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Fri Jul 3 11:22:00 2020 +0300

    Merge branch 'master' into fix/1820

commit 15650db35323009001fd427a74a312705b54ac86
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Mon Jun 29 12:01:51 2020 +0300

    '- client: Don't normalise disallowed domains'

client/src/helpers/helpers.js

@@ -306,15 +306,26 @@ export const redirectToCurrentProtocol = (values, httpPort = 80) => {
     }
 };
 
-export const normalizeTextarea = (text) => {
-    if (!text) {
-        return [];
-    }
+/**
+ * @param {string} text
+ * @returns []string
+ */
+export const splitByNewLine = (text) => text.split('\n')
+    .filter((n) => n.trim());
 
-    return text.replace(/[;, ]/g, '\n')
-        .split('\n')
-        .filter((n) => n);
-};
+/**
+ * @param {string} text
+ * @returns {string}
+ */
+export const trimMultilineString = (text) => splitByNewLine(text)
+    .map((line) => line.trim()).join('\n');
+
+/**
+ * @param {string} text
+ * @returns {string}
+ */
+export const removeEmptyLines = (text) => splitByNewLine(text)
+    .join('\n');
 
 /**
  * Normalizes the topClients array
@@ -533,10 +544,6 @@ export const getMap = (arr, key, value) => arr.reduce((acc, curr) => {
     return acc;
 }, {});
 
-export const normalizeMultiline = (multiline) => `${normalizeTextarea(multiline)
-    .map((line) => line.trim())
-    .join('\n')}\n`;
-
 /**
  * @param parsedIp {object} ipaddr.js IPv4 or IPv6 object
  * @param cidr {array} ipaddr.js CIDR array