Plater shortcuts not working and missing tips

[Rock Storm]

Originally reported by @DivingDuck in here.

• Plate builder (for STL files):
  Shortcuts [+, -, R,F] do not work, only mouse actions for zooming are working
  how to rotate a stl in x or y? Z works with [shift]+[mouse wheel]

• G-Code Plate Builder (gcodeplater und gcview):

  • Shortcut [F] (fit) causes to an non breaking error message in console window while [R] (reset view) is working fine:

    Traceback (most recent call last):
      File "printrun\gcview.py", line 313, in keypress
      File "printrun\gcview.py", line 276, in fit
      AttributeError: 'GcodePlater' object has no attribute 'model'. Did you mean: 'models'?
    

  • Same happen for gcview (the normal gcode plate in main GUI) when pressing [F] while the gcode file is not completely loaded.

• gviz.py:
  line 89 SetToolTip this seems to be shown nowhere and isn't working?(slightly reworked):
  self.p.SetToolTip(_("Click [Mouse-Right] to move the view, click [Mouse-Left]to pan the view, scroll with [Mouse Wheel] to zoom, and scroll with [Shift]+[Mouse Wheel] to change the layer."))

• gcview.py:
  line 456 SetToolTip (same as gviz.py line 89):
  self.glpanel.SetToolTip(_("Click [Mouse-Right] to move the view, click [Mouse-Left]to pan the view, scroll with [Mouse Wheel] to zoom, and scroll with [Shift]+[Mouse Wheel] to change the layer."))