Large update

-Renamed all config references to 'info' for clarity
-Updated TODO
-Set game window default size to 800x600
-Updated readme
-Demonstrative default skin file
-Skin loading in thunder.core
-Arbitrary module loading and keybinds in thunder.debug
-Reinforced game handle API
-Added config_menu state
-Added utility methods: array_copy, table_merge, table_invert,
table_serialize, sandbox_get, and sandbox_run
-Added official tests with 'startup' tests
-Added a stub for the configuration menu
-Added user configuration through the user.config file in
%AppData%\LOVE\electricity (dev builds) or %AppData%\electricity
(release builds)
-Created default keybinds for 1-9 lanes