DF Template Enhancements: More Template Snap Options

[LostCarcosa]

Issue: Although snapping templates to corners generally satisfies 5e's rule requirements, it does not work well with some effects that originate from self- namely Line and Circle templates. These templates would be better off snapping to the center of a square rather than the corner.

Describe the solution you'd like
Add the ability to snap to center instead of corner, and add the ability to manually set the snapping style for each template type (so the GM could set square templates to snap to corners while circles snapped to centers).

Describe alternatives you've considered (Optional)
Toggling snap would be a good stopgap measure (as per #334), but it would probably add work for the GM- either they have to police when template snapping can be off, or they have to be the ones who adjust all templates.

An alternate fix to line templates is to make the point of origin the corner of the line template, rather than the middle of the side, but I don't know if this type of modification is feasible.