eccccd7b09
=========================== Basic implementation of scene orientation tools. Most probably they'll eb re-exposed in UI soon. - Implemented "Set Floor" operator. It takes three selected tracks which has got bundles and makes them parallel to scene floor. One of selected bundles (active bundle if presents) becomes scene origin, the other becomes X-axis. Guessing of this bundles could fail. Camera tries to be on positive Z half-space. - Implemented "Set X-axis" operator. This operator takes selected track with bundle and aligns it along X-axis. This means rotation to make Y-coord of this bundle 0 is applied. - If camera has got a parent, then transformation would be applient ot this parent, not to camera. Useful for configuration when Empty is used to orient camera and some related stuff in 3D space.