work with function declarations in headers#1

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mrexodia wants to merge 5 commits intotcbhat:masterfrom

Commits on Jun 5, 2017

Commits on Jun 6, 2017

fixed a null dereference exception when argument parsing failed
mrexodia
committed

Commits on Aug 7, 2017

small fixes to the argument parser
mrexodia
committed

Commits on Aug 20, 2017

further improvements to the function parser (now works with templates)
mrexodia
committed