Alter the Rotation enum to be unambiguous as to direction.

Also fix warnings that show up on other compilers in test builds.

PCL PR 1205

This reverts commit f45da986.

Fixes clang warnings about uses of this obsolete keyword.

  * use round-to-neaerest in div of carotene

https://github.com/opencv/opencv/issues/7380

Aravis SDK: Basic software based autoexposure control

* Basic software based autoexposure control

* Aravis autoexposure: skip frame taken while changing exposure setup

we are drawing on a BGR image declared as RGB, so we should not swap
components here either.

also correctly forward spacing parameter in fontQt