Autosave hide manual saving and fixed column mask option

[birdybro]

• Made Autosave function the same as NES core (but left the toggle default state the same).
• Made it so people can enable Autosave even if the game does not support saving, just like NES and other cores.
• Column masking shouldn't be disabled, ran into issues with some SMS and GG games.
• Removed trailing whitespaces in emu module
• Fixed my mistaken indentation of the gg wire assignment on, I didn't notice that it was a single line concurrent assignment above.
• In system.vhd the signal vdp_y1 is unused, already talked to greyrogue about it. Gets rid of a warning message.