Moved the handling of ccommand's clientdata and delete-handlers into critcl::cdefs.
Extended critcl::cdefs's code retrieval to handle all vs just unamed blocks (ccode).
For extraction of defines and enums. Annotations to BuildDefines where frontend/backend borders are.
Moved calculation of system lib paths into "critcl::cdefs". Opened to the possibility of using "clibraries" info (like system headers include the "cheaders").