#4093 and #4100 are bundled in this PR
* qualified state-tiddlers for the tags input and fieldname + fieldvalue inputs
* newTagName, newFieldNameTiddler and newFieldValueTiddler variables defined in EditTemplate (all qualified through `qualify` macro)
* save-tiddler-actions macro in the EditTemplate (reused by the save-tiddler button)
* enter (configurable) in the fieldvalue field adds the field and sets focus to the next fieldname input
Edit:
* storyview="pop" for fields list