Finalize Marlie + other systems (V0.5.2)

This is the first test before public release (V0.5.2)
*Recommend to start a new game*
(The game is still in early development so expect some bugs/typo errors, if you encounter them, report them to me by DM me on Discord or the bug-report channel in Discord.)

New in V0.5.2:
+ New digestion mechanic
(Different girls will have different digestion speeds)
+ Increasing difficulty a bit
- Example: Marlie is harder to escape (she is a croc, duh), and her stamina regeneration is very low, but she can digest her prey pretty quickly.
Other girls have their own difficulties when you try to escape from them.

# Marlie
+ Added donate options (will change in future)
+ Added all scenes for Marlie's routes (OV, UB, AV)
+ There should be something more but I forgot

Change in V0.5.2:
+ Revamp Marlie
+ Applying digestion mechanic to all current girls
+ Launch an Exterminatus on bugs and typo errors

Bugfix in V0.5.2:
+ Bugs related to energy drink
+ Fixed a bug that causes you to return to the first greeting with Roxanne.
+ Fixed a rare bug in Marlie's sleeping scene
+ Fixed a bug in Amanda's AV scene, escape route
+ And some minor bugs