This makes the location of used program.local parameters more
predictable and eases sharing this space with other private constants.

wineps.drv: PSDRV_CmpColor() and PSDRV_Write{ArrayGet, InitClip, RRectangle}() are unused so remove them.

When a Font is looked up in the FontLinks table, they have already
been normalised by FontSubstitutes.

So no need to store system_links entries for fonts that appear as keys
in the FontSubstitutes list.

Entries in the list of linked fonts are keyed by the substituted font
name, so need to be looked up by the substituted font name.

msctf: Implement ITfCategoryMgr::RegisterGUID, ITfCategoryMgr::GetGUID and ITfCategoryMgr::IsEqualTfGuidAtom.

Custom actions in the CS3 installer depend on this.