Add VerticalCleaner filter to rgvs

Needed by QTGMC's lossless mode
Add missing file to MSVC Project file
Add height restriction to VerticalCleaner
Modify VerticalCleaner's error message
doc: Add documentation for rgvs.VerticalCleaner
Merge pull request #106 from HolyWu/master

Add VerticalCleaner to rgvs