Renamed ClkGen.v to Clk.v. Moved SyncToClock form HostIo to Clk.   Added parallel_case attribute  where appropriate.
Added size to localparams in order to prevent XST generating unpredictable results for unsized values in case statements and consatenations. Fixed col_s size. Names refactoring.
Added parallel_case where appropriate.
Added parallel_case attribute, no need to generate priority encoder here...
Adjusted OV7670 initialization settings (still no proper colors).