CLEAN: remove diagnostic unit test trace
FIX: Improve SSL cert expired warning
FIX: compiler warning.
REFACTOR: deprecate mprGet/Set thread priority.

These API are not meaningful cross platform. Also, Appweb, ESP, Ejscript to not need these.
FIX: compiling on XP
FIX: mprParseAddress for detecting https
FIX: default mime types for "mov"
FIX: add "mov" mime type
FIX: compiler warning for assert args.
REFACTOR: hardening from Appweb 5 just for good measure.