Kickr Fixups for WF Api 3.0beta08

.. still has a 20sec connection issue
.. no longer crashes on BTLE reset
Rename/Renumber intervals

.. will use entered text and append 1,2,3 etc
.. or if entry ends with a number, will start from that
.. eg; "Int#3" will result in "Int#3", "Int#4" .. "Int#n"

Fixes #513.
Fix SEGV on delete first activity

.. the RideFile::data member is used by the ride editor and was deleted
when a ridfefile is deleted, but we have no way of telling the editor.

.. now doesn't delete, which is a small memory leak.
Joule GPS : handle negative temperature
Edit interval