various rips

[Barack Obama]

Added:
- X-Zone (SNES)

All SNES with the letter X are now ripped (at least from this list:
https://www.vg-resource.com/thread-39674.html

Mission Briefings and Stage 1, but also this:

This was supposed to be a quick rip, but no, multiple issues have shown:

- one 8x8 block had to be moved 2 pixels by hand because this is how it looks ingame (row 1, frame 5)
- multiple variants of the same sprite exist ingame, sometimes certain parts are white, sometimes green
- these antenna parts are awful, there are even parts which are not in the VRAM but I add them to the tiled variants anyway

Should have tried the ball enemies or missiles.