Load star positions from ROM in Star Position Editor

The Star Position Editor module will now automatically load star positions into the GUI. If the ROM was edited using the Star Position Editor, the previously edited positions will now be reloaded. Opening a ROM that had the star positions edited in the same way will also work.

For Koopa the Quick races, the default vanilla coordinates will be loaded unless edited previously. For other stars, the default will load 0x01010101, which is interpreted from float to 0 int.

This MR also converts star position addresses that RM uses into an enum.