Revert "Make Wodo demo/testing code properly handle template documents"

This reverts commit 49803f61cbb2e0c4f0f970a814ede246adf3ca5d.
Revert "Expose setTemplate/isTemplate in Wodo.TextEditor API"

This reverts commit 681de3526e76f473c858d53de3acf5338330c4ce.
Remove entry from Changelog about support in Wodo.TextEditor for templates