684063c036
Refactor edit_cache tool selection to ask each global generator for its preference. Teach the Ninja generator to always use cmake-gui because Ninja by design cannot run interactive terminal dialogs like ccmake. Teach the Makefile generator to use cmake-gui when also using an "extra" generator whose IDE has no terminal to run ccmake, and otherwise fall back to CMAKE_EDIT_COMMAND selection for normal Makefile build systems.