Add Path tool feature for angle locking upon pressing Ctrl while dragging handle over anchor

[0SlowPoke0]

Partly closes #1870

Path tool - when dragging a handle:

• Ctrl locks the current angle of the handle (Add snap and lock angle modifiers for handle dragging to the Path tool #2160).
  • If pressed while the non-colinear handle is over its anchor, it becomes temporarily colinear and is locked to the angle of its opposite handle, or if there is no opposite handle then it should not become colinear but it should become locked to the angle of its shared adjacent segment angles

[Keavon]

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[Keavon]

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[Keavon]

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