ctrlport: adding back old (almost) style API for controlport.

Allows us to create controlport interfaces from a name and object pointer and not just the alias of a gr_basic_block.
ctrlport: removed obsolete files.
ctrlport: fixing interface to rpcbasic_register_variable for new API to other functions.
build: generated headers naming issue fixed.
Merge branch 'next' of gnuradio.org:gnuradio into next