work on new UI for tag-based folder policy

added new listmangler widget for mangling tiddler list fields. added
back in addprefix and addsuffix filters for backward compability with
older TW5 core versions.
Revert "work on new UI for tag-based folder policy"

This reverts commit c5017a38d42e4480562381b5cdf9753018de075b.
Revert "Revert "work on new UI for tag-based folder policy""

This reverts commit 6f9d9e6ff923fb8dda80208d40473b94872368f9.
hashify and UI update

added handling of config options in separate tiddlers
added UI candy
fix move element backwards; movement button icons

also added a macro that sanitizes tiddler tiddlers to sane folder names
several macro and widget fixes

handling border cases correctly
more UI work on tag folders
tag folder policy finalized

added code to handle new configuration scheme. added support for ordered
tag folder list.
updated documentation
Merge pull request #2 from TheDiveO/new-tag-ui

Prioritized tag-based folders with new config UI