D&D folder with videos onto Clapper window to play them as video playlist. If folder contains exactly one video and subtitle file, then that video will be played with subtitles automatically applied.
Play video with external subtiles by:
* selecting and opening both video+subs from file chooser/manager
* dropping subtitles file on player window
* opening subtiles from file chooser/manager while video plays
* send their file path/uri to player via WebSocket message
Adwaita theme has unusually small media constrols icons, but other popular themes do not. Instead increasing those icons on every theme do it only for Adwaita where problem occurs.
Add support for keyboard shortcuts for menu items. Additionally enable a common Ctrl+O for opening new file(s) and Ctrl+U for opening an URI.
Closes#45
Adwaita does not have rounded corners yet, but will have soon. Enforce rounded corners in the app only for Adwaita to avoid bumping min required GTK version.
The "clapper_src" directory name was unusual. This was done to make it work as a widget for other apps. Now that this functionality got removed it can be named simply "src" as recommended by guidelines.
