VZooming remains on by default in Audacity itself.
Also kGuard (the gurard zone in the VRuler) reduced from 8 pixels to 5pixels
following feedback from Steve.
1: Guard zone 8 pixels wide in VRuler to reduce risk of accidental use.
2: VerticalZooming preference, for VRuler zooming, off by default,
3: Enabled Paul's right-click menu in VRuler with some extra
presets (x2 and x0.5)
4: Rearranged some messy code with lots of ifs to use a switch.
Also, with EXPERIMENTAL_HALF_WAVE defined we now get a
'half wave' option in the VRuler menu, that shows the wave top half.
We also use it in collapsed waves (and collapsing and restoring
a WaveTrack will get you back to normal zoom.
I've implemented three states for what to do if no selection:
0 - Grey out (no longer used)
1 - Auto-select
2 - Give the warning message and try again.
It's now in recording-prefs rather than track-behavior-prefs, and to make room latency options (which are related to device) ar enow in device-prefs. Naming of new tracks has also been made slightly more compact.
