release for blacklight >=7.0, < 7.8

[ebenenglish]

Due to some substantial changes with rendering constraints in Blacklight 7.8, it makes sense to have separate versions of blacklight-maps to support compatibility with pre/post 7.8 blacklight.

The v1.1.0 release supports >= 7.8.

We need make a release for >=7.0, < 7.8, which should be tagged as v1.0.0.

This should be fairly easy, almost all the v1.1.0 code should work, except for a few methods in RenderConstraintsOverride that will need to be tweaked.