[NTGDI][FREETYPE] Introduce font look-up cache (reactos#8641)

Text rendering speed is justice! Font
search is heavy operation. Adding
cache to it is rational.
JIRA issue: CORE-19898
- Define FONT_LOOKUP_CACHE
  structure.
- Add s_FontLookupCacheList
  global variable to save cache.
- Use cache in FontLink_PrepareFontInfo
  and TextIntRealizeFont.

Author: katahiromz