Console fixes, OGL warnings
- clean up some vogl_printfs to vogl_verbose_printf
- add cMsgFlagOpenGL flag to console output
- add vogl_glwarning_printf, vogl_glerror_printf
- prefix output with "OGL " when flag is set
- add GL flag and caller_info to print_detailed_context, etc.
- add option to spew print caller information always
- set timer output to vogl_verbose_printf
- find opengl library in vogltest makefile
- add vogl_quiet and vogl_verbose options to tracer and steamlauncher
- move vogl_console_init to dlopen so it can use vogl_printf functions