R4 profile, XInput backend improvements, etc.

[avahe-kellenberger]

Github is currently showing many changes in files which actually have no difference between the master branch and my fork. I'm partially opening this PR to see if it fixes the comparison.

[ribbanya]

@avahe-kellenberger Could you summarize any changes in this PR (or other findings you've come across) that would pertain to #26? I'd like to get that merged at some point.

[ribbanya]

By the way, if you use a two-dot comparison then the problem mentioned in the OP should resolve, like this.

[avahe-kellenberger]

The problem showing randomly changed files was fixed, which is nice.

The primary changes of the PR are adding an Ultimate mode for the R4 B0xx. It works well. I've also made minor changes to DInput and XInput which fixed some small issues, I'll leave some comments on the code.

[ribbanya]

That all makes sense! Thanks for taking the time to explain.