[Title] Added a new memory tracing feature(and some minor updates)

[Title] Added a new memory tracing feature(and some minor updates)
[Issue#] J number N/A
[Problem] N/A
[Cause] N/A
[Solution] Changed following items

  - Added a new memory tracing feature (client allocated textures and renderbuffers)
      COREGL_TRACE_MEM=1

  - A PID is notified on the top of all tracing message

  - Added context tracing when FASTPATH is disabled

  - Added a BUILD-DATE info on the launching message
      [COREGL] <PID> (BUILD-DATE) Library initializing...

  - Disabled APPOPT logs

  - Fix minor bugs
      invalid value of 'Swaps per sec' of the API trace