Get rid of comma in delete statements.
Be consistent with NVIDIA name.
Installer: Use Inno Setup Preprocessor's `AddBackslash` function.

Also bump the required Inno Setup version in VSFilter's installer.
build.bat: Add error checking when extracting the DX cab files.

Also allow `EXPAND` to show info when doing its job.
Indentation improvements and trim trailing spaces from comments.
Use conversion constructors to work-around confusing AStyle styling.
FakeFilterMapper hooks: Document the check for "negative" registry key handles.
FakeFilterMapper: Don't call Init() unless we are sure it's safe to do so.
Improve the Get(Cur)DispMode and SetDispMode functions.

Fixes CID #966222.
Use a bitcheck instead of casting (WIP).

Fixes CID #965944.