Chromecast fixups, run.sh dirty venv mode, typing, enable warnings module and fix closing file handles

[C0rn3j]

Fixes up one issue out of two in #1291

Had to move the Menu class so the diff is a bit wonky when viewed together.

Fixes a bunch of missed g() renames.

Enables additional (??? docs make it look like they're default) warnings like:

/home/user/Projects/Tauon/.venv/lib/python3.12/site-packages/tauon/t_modules/t_main.py:44663: 
  ResourceWarning: unclosed file 
    <_io.TextIOWrapper name='/home/user/Projects/Tauon/.venv/lib/python3.12/site-packages/tauon/theme/Turbo.ttheme' mode='r' encoding='utf-8'>
  load_theme(colours, theme_item[0])
ResourceWarning: Enable tracemalloc to get the object allocation traceback

Fixed all revealed warnings by the above, this involves not closing file handles in various places, themes and DB accesses included.
May fix memory leaks that some people complained about in #1128.

Add a way to run dirty venv to run.sh - this moves the current options up by one sans numero 1.