Jucer doesn't support namescape::classname notation

the Jucer doesn’t support the :: operator inside parent classes declaration like namespace::classname, it’s converted to namespace__classname

ah - ok, well it’s easy enough to tweak makeValidCppIdentifier() function to remove the colons from the list of banned characters.

sure, just wanted to let you know.

I already use a customized version which saves files in ASCII instead of unicode. and fixes the Slider::Horiz… issue