Expose states as datasets, fix for multipages and allow template-strings
Description
This release contains a three minor things, pushed through #232, #235 and #236. Thanks for the PR's! Now you can use dataset_set to set a dataset on elements, there's a fix for multipages, and enabling the usage of template strings like element: floor.${entity.entity_id}
Please do report, if you find anything that doesn't work after the following changes, listed below.