ROM Properties Page shell extension v0.8.1 (IExtractIcon fix)

The IExtractIcon implementation (used for icons on Windows) was setting GIL_DONTCACHE in the Debug build, but not the Release build. Turns out we aren't setting the caching information correctly (and I'm not sure what's needed for that), so the Release build was causing all handled files to have the same icon as the first file that was checked.

This build sets GIL_DONTCACHE for both Debug and Release.

NOTE: For Linux, use v0.8-beta1. This build only has changes to Windows-specific code.