WIP:  Add performance counters to RazorDb
Fix perf counter creation
RazorPerformanceCounter class to allow calls to Increment() even when perf counters failed to initialize.
revert metadata cache to volatile cache
Lock the performance counter initialization and trap all exceptions
Fix exception handling so invalid value length throws expected exception
fix unreference exception var warnings
Turn off vshost for all projects
Razor TableEnumerator for sorted block tables
Cleanup variable names and locks
Put Dispose for manifest on worker thread
Revert "Put Dispose for manifest on worker thread"

This reverts commit e98f82221491027453d430aa8d76d47790f8ab60.
Log exceptions when sbt's are in use and can't be deleted
All sbt opens managed by try/finally for close.
Clear cache and adjust cache sizes.
Return to the use of the Explicit attribute now that Bolt supports it