Remove global cache for templates to allow changes #108
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Having templates cached globally means that the template cannot be changed and the docs rebuilt in the same sbt process. So to change the template and rebuild, we need to keep restarting sbt / running in batch mode. Rather than invalidate the cache, I've just removed it completely. StringTemplate already provides caching for the template group, as far as I know. Also move the default template name to an sbt setting.
Also add an sbt-test that makes some changes to the template (and starts by overriding the generic template). This test will fail with the cached templates, without these changes.
Related issues: #91 and #101.