webmdshow clean up: Mass file extension update.

Rename all files:
- .cpp -> .cc
- .hpp -> .h

Update all references to renamed files:
- .cc, .h files: hpp -> h
- .filters, .vcxproj files: cpp -> cc, hpp -> h

Change-Id: Ibb58c68e2ea4add092d17ba069e30be33990cf18
284 files changed