core/utils.py: `entry_point_files()` now gracefully handles the situation where a plugin has an entry point registered but is actually missing/has been removed.
cooe/server.py:  `ApplicationWebSocket.get_theme()` now gracefully handles the situation where a plugin has an entry point registered but is actually missing/has been removed.
app_terminal.py:  Fixed a bug where you could get an exception trying to generate the 50terminal.conf for the first time.
Playback plugin:  Fixed a bug where the playback controls would appear when applications other than the Terminal were running in a given workspace.