…xport. Fixed many circular dependencies, still a few remain

…om index into dedicated js. pulled table code out of bt.js. updated a bunch more references

…s row button creation and operations, moved intro message markup into messageManager, minor other import/export shuffles

…tice on all files

…m sendMessage to localStore to setProp (which updates local store anyway). also Theme -> BTTheme for consistency

…rol. Not done, pushing to get it backed up

- Fixed a bug in redisplay of session nodes, don't need to delete
- background click handler was registered too many times
- filter out irrelevent tabNavigated events where url doesn't change