inspector: graph: add signals for clicks on in/out indicators
inspector: display output vector data when output indicator clicked
inspector: merge main_controller.cpp/h into main.cpp/h
inspector: use QMainWindow
inspector: make controls/realvec widgets (un)dockable
inspector: controls widget: make display more practical

* Show columns in order: name, value, type.
* Resize name column whenever repopulating list.