[Feature request] Python plugins user-friendly ideas

[akruphi]

@m32 great thanks for python plugins subsystem in far2l.

1. Now I can load python plugins only individually via command line py:load. It's not enough convenient.
   Please add in Plugin menu (by F11) separate item (may be with name Python plugins management) which show VMenu with follow columns:

   • available *.py file name
   • status (load / available=unload)
   • location dir: user profile subdir or far2l subdir
   • label from py (may be only for loaded if it difficult for all)

   and by Enter in each row make quick load / unload action.

2. Add possibility to load py-plugins not only from user profile (~/.config/far2l/plugins/python) but also from far2l subdir $FARHOME/Plugins/python/plug/plugins/

3. Now

   far2l/python/configs/plug/far2l/pluginmanager.py

   Line 9 in bd0d990

   USERHOME = os.path.expanduser("~/.config/far2l/plugins/python")

   use hardcore path ~/.config/far2l but far2l -u or $FARSETTINGS or $XDG_CONFIG_HOME can override far2l config dir. In C/C++ code you can use InMyConfig("",FALSE).c_str() to obtain real config directory. If it possible please implement this feature.