Support different Readingmodes

[NicoHood]

@mizuyoukanao check this out. I've corrected the files accordingly. Can you please test this PR? What reading mode does pokemon XD use, so I can document that this mode is 100% tested? Did you also test the other modes?

Superceeds #25 #31 and #34

[NicoHood]

@DinsFire64 @trevor403 can you guys please also test this?

[mizuyoukanao]

I've been testing Pokemon XD (mode0).
I can press all buttons and sticks and it seems to be stable.
(There was one bug where setting yAxis/cyAxis to 0 caused the same behavior as 255 in the game, but this is just a Pokemon XD specific bug and should work fine with other software that uses mode0).

[NicoHood]

Do you know other software that uses mode 0 (or 1, 2, 4, 5, 6)? Maybe we need to fix this 0->255 "Bug"?

[mizuyoukanao]

Sorry, I don't know of any software that uses anything other than mode0 and 3, and I don't have any...
The bug with 0 being 255 only happens in Pokemon XD and can be worked around by setting 1 instead of 0. Other game does not have this problem, so a fix for this is probably not necessary.
reference

[NicoHood]

What do you mean by "other software"? Which game?

[NicoHood]

I just merged this PR as I do not expect it to cause much additional trouble. It increases the sketch size by ~150 bytes, due to the additional convert method.