I suggest to remove libappindicator support

feature (#37): included in this PR

I believe we need to do this tasks to have working X11 version.
Stable X11 version:

• Fix progress dialog (“not doing its job correctly”).
• Fix play button (“xdg-open return no such file or directory”).
• Fix some Gtk messages related to “main.ui”.
• Fix is_file_already_exists function.
• Return missing video formats to combo box.(Not really fixed)
• A̶d̶d̶ i̶n̶d̶i̶c̶a̶t̶o̶r̶ f̶u̶n̶c̶t̶i̶o̶n̶a̶l̶i̶t̶y̶.(dropped)
• Add timer to header bar.

@ochibani I fixed colors of button select and area selector to use theme colors

Select a Window is not supported in Wayland due to security measures.

@ochibani that wired
I know discord, slack, brave and others support select window

Audio recording not working in old version gtk3 due to how record button function works, so I removed the audio only record functionality as it's not core functionality for blue recorder.

Thank you, I will merge your changes