Project.xml cleanup and Linux/Mac setup file

[crowplexus]

my fucked up thing wouldn't compile so i took the time to clean up and change a few things

• default save folder is changed, your data will be wiped, probably would be wiser to make a save data transfer but here we are
• all libraries included with the engine are now using set versions to prevent compiler errors (happens more often than not.)
• fixed that one issue where the game tries to find the assets/songs folder to no avail and prevents compiling
• included a setup file for linux and mac

would probably be wiser to use haxe module manager for the setup files but ehhh its FINE

doesn't fix actions cus that's a separate problem

did all of this while in LTE/3G network :<