[utils] modified GetRecursiveListing and GetRecursiveDirsListing to accept directory flags
[advancedsettings] added 'proof' and 'subs' folders to movie excludefromscan expression
[videoinfoscanner] modified fasthash method to incorporate the exclude from scan expressions and return a md5 hash
[videoinfoscanner] recursive fasthash for enumerating series folders
[videoinfoscanner] don't hit an already processed series folder twice
Merge pull request #4837 from mkortstiege/videoinfoscanner

videoinfoscanner optimizations