Map is now global

Put the map data in GlobalVars so you can switch between modes and have
your changes show up in the other mode.

MapEditor is now just "Editor" because the console would see "MapEditor"
as a class and apparently you don't even have to typecast to put a class
into a string.

Access the console with the tilde (~) key and set GlobalVars.window =
"Editor" to go to the editor and GlobalVars.window = "Game" for game
mode.

It is recommended that you learn to save your map before changing modes
because in the future every change made in MapEditor mode will likely be
gone after switching maps in Game mode.