Moved LDObject lifetime management from Model to ResourceVector. This is a large refactor that removes some hacks from the Model class.

Added a new type ResourceVector which manages object lifetimes, and used it to remove a bit of memory management.

Polar grid is now togglable.

CMake fixes

Added polar grid snapping code.

Added polar grid rendering (which is disabled for now).

Grid::snap now snaps points.

Simplified Grid::snap.

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