Core Update

Updated Core again. Will post the new version after a little more work.

Update:

• Cleaned up code abit
• Added new classes: Screen, MainMenu
• Additionally a new Game logic class was added.
• Though I'm thinking this will become its own fil
• Added a keyboard state handler (keymaps should  be eaiser maybe)
• Added some code to disable pyglet default Escape key behaviour
• Added/fixed various graphics options: set_vsync, show_fpsdisplay
• Added/fixed the way graphic "layers" are displayed. This should reduce flicker. Also added some organization, so things aren't so messy.

To Do:

•  Add some fancy stuff to loading screens:
• Loading progress bar?, Percentage, Text display to show what is being loaded. (Lowest priority)
• Test to check for if usercfg exists + options for whether or not it does
• Autologin?
• Fallback if default font does not exist
• Add custom image loaders for menus etc.
• Fix mainmenu handles and add new for setup, etc.
• IMPORTANT!: add an exit handle