Move t3lib_tceforms_fe into its own file
Currently, t3lib_tceforms_fe is located within the main t3lib_tceforms file which violates the CGL requirement of one class in each file.
While moving it to its own file, small CGL cleanups have also been made.
(issue imported from #M10046)
Compatibility is broken :( If someone uses this class, it will be expected in the old file. To preserve compatibility the old file should include the new file with appropriate comment.
t3lib_div::makeInstance() should take care of the loading if people actually create the object correctly but I guess it won't cover every case.
Attaching a new patch that does the include.
Committed v3 patch to trunk in r4709.
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