Lots of land... uh, changes:

Removed Patch selection, validity check in Legacy Patch Installation
code (uses file selected in modernextract.py)
Changed mod information display in Modern Patch Installation code
Small logging changes in Modern Patch Installation code
Changed versioning scheme: three digit version number, separated by
periods,
"Stable" keyword for releases, "Unstable" keyword for work-in-progress
builds
Updated Documentation/CONTRIBUTING.md
Wrote PatchIt! Windows compiling instructions
(Documentation/CONTRIBUTING.md)
Updated Documentation/TODO.md