Minor copy version information improvements.

* Add build type (debug/release) for wxWidgets library  versions greater
  than 2.8.
* Add build type (debug/release) for KiCad.
* Add missing build options.
rtree.h: suppress compil warnings about not initialized vars.
Pcbnew: add WIN32_LEAN_AND_MEAN define in github_plugin.cpp. Note: this define is already in use in avhttp build (Windows specific)