feat: Look and feel module/management support

[azubieta]

Create a module to handle the desktop look and feel. Don't include a GUI by the moment.
Characteristics:

• Icon theme management
• Font management
• Colour palette management
• QSS management.

[mckaygerhard]

theres the historically repository : https://github.com/MoonLightDE/mlde.m.thememanager so for that task all the work must be there, let open the task but reception of any news of this must be in the mail list so lock the conversation until reorganization are in good shape..

[mckaygerhard]

i'm still busy with microcpp service packgin but here font rendering need to manage 3 king of files:

https://www.pismotek.com/brainout/content/nice_looking_fonts_for_rebels.php

later i document more that problem for new desktops..

LXDE only takes care if a LXDE session are active.. LXQT do not take cares of the rendering style