Register a new "cvf-logging" experimental feature keyword and guard both
RiaCvfLoggingManager::initializeCvfLogging() and shutdownCvfLogging() with
RiaPreferencesSystem::current()->isFeatureEnabled("cvf-logging"). The bridge
now stays disabled by default, and can be turned on for troubleshooting via
Preferences -> System -> Experimental Features.
Also document how to enable and use it: added a step-by-step usage note to
RiaToCvfLogging.h (enable the feature, restart, use --loglevel debug to see
cvf's debug output, look for the 'cvf[<logger-name>]: ' prefix) and expanded
the experimental feature description shown in Preferences -> System ->
Experimental Features accordingly.
cvf loggers default to LL_WARNING on a console destination and are never
wired to RiaLogging, so cvf's own diagnostics never reach the log file. A
rendering failure is therefore silent, with no artefact a user can send us.
Add RiaToCvfLoggingBridge (cvf::LogDestination) and RiaCvfLoggingManager,
mirroring RiaToCafLoggingBridge, to forward cvf log events into RiaLogging.
Wire initialize/shutdown into RiaApplication.
cee.cvf, cee.cvf.OpenGL and cee.cvf.qt follow the application log level:
LL_INFO normally, LL_DEBUG only when the application itself is set to debug,
so normal runs stay quiet.
Magne Sjaastad