Add the 3D view ruler as a tool,
the modal operator remains for now
however it may be removed if we use the tool-system for 2.8.
Note that this does copy code from the operator,
its different enough not to attempt to de-duplicate.
Tool for creating polygons, exact usage may change based on feedback.
LMB to add faces at boundaries (tris from edges, quads from verts).
- Ctrl splits edges
- Alt to dissolve edges/verts.
Works well with vertex snap & auto-merge.
This uses selection hover but isn't intended to introduce more widely
pre-selection highlighting, at least it will be restricted to this tool.
The tool-system it's self is primitive and may be changed.
Adding to 2.8 to develop operators and manipulators as tools.
Currently this is exposed in the toolbar, collapsed by default.
Work-flow remains unchanged if you don't change the active tool.
Placing the 3D cursor is now a Click instead of a Press event,
this allows tweak events to be mapped to tools such as border select,
keeping click for 3D cursor placement when selection tools are set.
