[#986] Allow for rotating a square/cube template

[krbz999]

It is now hip to be square.

Ideally the ability to rotate a rectangle without changing its height or width would be a core improvement. However given that the system can neither rotate properly while placing it, nor afterwards, setting squares and cubes to be equal-side ray templates is a good solution in the meantime.

Closes #986

[Fyorl]

A good change but let's add a system setting to allow DMs to have the old behaviour and prevent players from being able to rotate square templates since that is apparently a preference some DMs have.

[krbz999]

Done so. I feel it's fair to prevent it, but the default should be to allow it (going by the discussion in #986), so I have set the setting to default: true.

[Fyorl]

Code looks good. I think we should lend some weight to maintaining the status quo here so that there are no surprises when people update, but I don't feel that strongly.

[Fyorl]

@krbz999 I've made a change that I hope is a reasonable compromise. The setting is now renamed to frame it as opt-in to prevent square templates from being rotated. The setting is on by default however as that matches the system's previous behaviour, so this way it's a smoother migration path.

If you feel very strongly, we can discuss and perhaps revert the commit on your branch, but otherwise hopefully we can proceed.

[krbz999]

Fine by me. Yeet.