dropping files to Kicad manager :
*.kicad_pro, *.pro -> open project;
gerber and job files -> open in Gerbview editor;
Eagle and Cadstar files -> open project.
dropping file to schematic editor -> append schematic;
dropping library file to Symbol editor -> add library;
dropping board file to PCB editor -> append board;
dropping library or footprint file to Footprint editor -> add library or import footprint;
dropping ZIP file or gerber files to Gerbview editor -> open files;
dropping sheet file to Drawing Sheet editor -> open sheet.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/11638
After commit 9535153f9e there were no more IDs inside the legacy ID
system. Therefore the entire system for dispatching and looking up
the legacy ideas and handling those events can now be removed and
the tool dispatcher simplified (it no longer needs to know about
the ACTIONS class).
