New version

Closes #15, #16, #17, #18, #19, #20, #21, #22, and #23

See merge request !19

remove validation from GDGraph class and implementing the procedure in GDGraphHelper, some imporvements and other fixes

move the PM algorigthm to comparing `sname` instead of `name`, changing the `isliketo`-method, adding comment in the TODO, adding one ignoring

some fixes and improvements of the GDGraph, some changes in annotations, writingsmall test of the GDGraph

adding common getter designed within getbyname and getbylayer, adding TODOs, some codestyle improvements, update docstrings

remove old test and previous version of patternmatcher, improving code and get rid of extra logic, fixing bugs and errors, remove old library and update parsing of libs

adding meta GDMeta into GDNode, adding some caching into GDNode, adding isliketo method to compare nodes, some other fixes and improvements, adding argnames method into the GData class, improving docstrings