Touch swipe movement

[NyakoFox]

Changes:

The current mobile version of VVVVVV has three movement types: swipe, d-pad and sides. Swipe is the default, but my PRs have only implemented d-pad. This commit adds swipe and adds it as the default.

Depends on #1164.

Legal Stuff:

By submitting this pull request, I confirm that...

• [x] My changes may be used in a future commercial release of VVVVVV
• [x] I will be credited in a CONTRIBUTORS file and the "GitHub Friends" section of the credits for all of said releases, but will NOT be compensated for these changes unless there is a prior written agreement

[NyakoFox]

Apparently this has a few bugs, so I'm leaving this as a draft for now.