UI Nits: Emboss Splitter + - menu icons

.. changed icons since they don't emboss well algorithmically
(yeah, the algorithm is very basic for now).
UI Nits: Groove highlight line

Seriously OCD / attention to detail, adding the highlight line
on the scope bar, icon bar and splitter handle. Most folks wouldn't
even notice it.
Fix SEGV on add/delete event in LTMSidebar

.. need to use selected items, since its not always called via a
right click - there is a button on the handle for that now.
Code Cleanup: Strava download Xcode warning

.. adding a number to a string.
Fix SEGV on edit event details

.. part of migration from right click to splitter.
Fix Home Sidebar Season Editing

.. it broke when we moved from right click to splitter buttons.
UI Nits: Splitter actions for TrainTool Devices

.. add and delete devices.