Add lever and jump pad components with activation logic

addons/rmsmartshape/documentation/Controls.md

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+# SmartShape2D - Controls and Hotkeys
+
+<!-- TODO: Likely, outdated. Should this even be covered in such detail? -->
+
+## Controls - Point Create
+
+- Add Point
+  - Left Click Anywhere in the viewport
+
+- Leave Point Create Mode
+  - ESCAPE
+
+## Controls - Point Edit
+
+- Add Point
+  - Either:
+    - Hold ALT and Left Click Anywhere in the viewport
+    - Click on an edge between two points
+
+- Grab closest point
+  - Hold CTRL
+
+- Cycle through texture indices of a point
+  - Mouseover a point and MOUSEWHEEL up or down to increment / decrement the texture index
+
+- Flip texture
+  - Mouseover a point and press SPACE
+
+- Change texture width property
+  - Mouseover a point, hold SHIFT, then MOUSEWHEEL up or down to increment / decrement the texture width
+
+- Add Bezier curve
+  - Mouseover a point, hold SHIFT, then click and drag to create control points on the point
+
+- Create New Shape
+  - Hold SHFT + ALT and click
+    - The location of the click will be the the first point of a newly created Shape Node
+
+### Overlap
+
+When multiple points and edges overlap, it can be ambiguous what clicking will do.
+SmartShape adheres the following rules:
+- If a control point overlaps a vertex, the control point takes priority
+- If a control point or vertex overlaps an edge:
+  - Clicking will move the control point or vert
+  - Clicking while holding ALT will create new point on the edge
+