Plus42 Equations, Preview Release

[Thomas Okken]

New update:

1. Automatic skin stretching. So regular Free42 skins can be used, and are automatically modified so the 131x64 display will fit.
2. Minor bug fixes and performance improvements.

Note: this update is only for Windows, Mac, and Linux; the Android version uses completely different code for skin loading and display, so that will take a bit more work. Expect it later today or tomorrow.