picojson::parse: use LC_NUMERIC = C
jsonload: eliminate un-needed item factory finding for new itypes
Reduce 3+ second json load to ~2 seconds by eliminating ~240000 fseeks
Fix misaligned SDL graphics and list_items pointer etc
Revert 3b3d533 which removes symmetry adjustment for TERMXY
Merge branch 'master' of github.com:yusiwen/Cataclysm-DDA