opject panel: rework shotcuts: let the user decide

This implemetation respect the users action shortcuts,
handled in this order:

1) Two hardcoded keystrokes:

* crtl+f engage search on tree view
* esc: defocus: next keystrokes goes to desktop

2) Try to invoke user defined shortcut action

3) RETURN-key: activate action of selected column
   currently works on the name-column only

4) shortcut goes to Treeview

For the testers:

The new verbs "stack up/down" are not bound to keystrokes. Set them up as you like via
preferences / interface / keyboard shortcuts / selection / stack up and down

Try keystrokes with focus on desktop, on object-panel and compare with layer-panel:

PageUp/Down + - shift, ctrl

esc esc

arrow esc arrow

ctrl+f

V, H - may(!) flip objects

ctrl+a (!)

! invert selection

Beside user definable keystrokes, there are some hardcoded:

arrow-up/down + shift,ctrl

[ ] - rotate objects - not user defined actions, so does not work in panel focus

/ * also keypad / * is usually fold/unfold tree but * actually selects the "star tool",
which can be disabled if you don't like that

Conflicts:
	src/ui/dialog/objects.cpp

(bzr r15698.1.10)

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