- made Discord RPC preparations
made `discord-rpc` cli utility
made `DiscordRPC` class to manage it
- changed `'` to `"` in every command execution
- `Voice.current` field changed to `Voice.installed`
- `Voice.selected` field now returns list of selected voice packages
- added `Voice.delete()` method to delete voice package
- `Voice.isUpdatePredownloaded()` method now can check list of voice packages
- fixed ProgressBar's `showTotals` property work
- decreased maximal wine prefix creation log size in progress bar
- improved `Process.run` command which now finds correct process id
- made DropdownCheckboxes component
- made voice packages selection system
