This adds Reset() method to KIFACE to reload global libs stored in global static vars. Also refactors some lib reload code in various frames to have common MAIL_RELOAD_LIB handler. Fixes https://gitlab.com/kicad/code/kicad/-/issues/12500
No code change, but it fix an issue specific to msys2 that bother me when trying to fix issues with wx 3.0.x version
Fixes https://gitlab.com/kicad/code/kicad/issues/7877 Fixes https://gitlab.com/kicad/code/kicad/issues/5153