Client: Continued updated logging with domain-specific LOG macros
Client|Cleanup: Continued updated logging with domain-specific LOG macros

Also, removed old client-specific VERBOSE or other log-related macros.
API|Refactor: Bumped WAD API to v2, removed a function

W_CheckLumpNumForName2() is not really needed, as the only purpose
of the extra parameter was to suppress a log message. The Log will
decide on its own whether to filter messages.