Make TIK less Aeon-focused

[TobiPeterG]

Currently, TIK is very Aeon-focused and the modules can hardly be shared. To fix this, the following functionality should be refactored:

[Upstream] Feature

• mounting in post modules should be handled in a central place;currently per module (started)
• handling the progress pipeline should be handled in a central place;currently per module (started)
• No Aeon-specific variables should be used in modules/the installer

Initial work has already started here: https://github.com/TobiPeterG/tik/tree/refactor-tik

[TobiPeterG]

PR open: sysrich/tik#62