Fixed some bugs and made the code nicer

Some minor changes, but you might want them.

Fixed:

• Some elements might try to access and destroy a list in a random order, sometimes causing a crash
• Text input not responding to input correctly

Changed:

• Got rid of the heinous underscores in front of constructor parameter names, because the GameMaker bug which that worked around is long gone
• “Private” variables are now prefixed with an underscore, and also defined below the “public” variables in constructors, to make it more clear which ones shouldn’t be messed with
• Starting to move away from ds_maps and ds_lists, since structs and arrays are properly garbage collected

Removed:

• EmuTextbox_H because it wasn’t working properly and I don’t like having that much duplicated code (I’ll add something similar to regular EmuInput later if that was a thing people want)