Blender Git Loki

Bugfix: No enum tooltips displayed for many 3D view navigation tools (+ Code
cleanup)

* Enum tooltips will only be detected in the case that we assign that as the
default property (ot->prop) of the operator. Set all of the offending properties
to get this status, since those operators would be useless without that property
anyway

* Improved the wording/capitalisation of a few of these tooltips and labels