- cgui: now convert EventName to lowercase in SendEventToAll
- compression: now use "fastest" compression mode and more memory unless in FINAL build. this greatly speeds up archive generation at expense of 1.5% size increase (fine during development). done because profiling shows ZLib accounts for 78% of CPU; practically nothing else shows up, which shows effectiveness of compressing in parallel with reading from disk.
- file_cache: documented; fixed several potential issues with exact_buf when invalidating files.