Allow naming sketches like "RCS" and "CVS" #537
                
     Merged
            
            
          
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Fixes #522
The filter we use to ignore files contained in version control systems' cache was applied to the sketch folder itself, thus preventing a sketch to be named like
RCS.This PR increases resiliency by avoiding panics if a sketch name couldn't be found and applies blacklist filters only to folders contained in the sketch, i.e. excluding the root folder.