============================================
A new enum to remove magic numbers for constraint tags.
A previous version of the commit introduced more magic numbers, which
demonstrated not to be up for the task.
About the Tag numbers:
- Positive Tags identify a higher level constraint form which the solver constraint originates
- Negative Tags represent temporary constraints, used for example in moving operations, these
have a different handling in component splitting, see GCS::initSolution. Lifetime is defined by
the container object via GCS::clearByTag
- Hardcoded value -1 is used for these constraints.The effect is parameters are not truly enforced
(it gives a nice effect when dragging the edge of an unconstrained circle, that the center won't
move if the edge can be dragged, and only when/if the edge cannot be dragged, e.g. radius constraint,
the center is moved).
be8e5ac338