Add layer locking feature

[haikalvidya]

This will close this issue ticket https://github.com/GraphiteEditor/Graphite/issues/1127.

Adding Layer locking feature, the behavior of this feature:

1. Make the layer cannot be drag
2. Disabled transform cage when selected object
3. Can't be modified with G/R/S, or with nudging
4. User still can click through the locking layer to select other object behind it

Closes #1127

[Keavon]

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[Keavon]

• [x] If a parent is locked and so is its child, the icon is incorrectly showing unlocked for the child
• [x] You'll need to add NodeGraphMessage::ToggleSelectedLocked as an action in actions_with_node_graph_open() in order to make Ctrl/CmdL work.
• [x] If I select a locked layer and a non-locked layer:
  • [x] In the Select tool, I can click and drag the non-locked layer and they both move, and the same for resizing
  • [x] In the Select tool, the yellow pivot widget shows the bounding box calculated based on the locked and non-locked layers, instead it should calculate based on the bounding box of just the non-locked layers; and if ALL the selected layers are locked, no pivot shown be shown at all
• [x] We want to exclude the selected layers from all of these actions: That means both the code which checks if those icons (pivot basis, alignment, flipping, boolean ops) should be disabled (filter out the locked layers when the selected layers are counted) and the message handlers for alignment and flipping.

[Keavon]

!build

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[Keavon]

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[Keavon]

Ok, with that tidied up, I've checked off the items in my checklist above. So there's still a few small things needing improvements but it's very close now!

[Keavon]

!build

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