Blender Git Loki

Cleanup: remove redundant math calls

Cleanup: simplify ED_view3d_from_m4

BLI_math: add invert_qt_normalized

When the quat is known to be unit length, so we can avoid scaling
(just conjugate_qt which asserts on non unit quats).

Cleanup: rename 'datablocks' -> 'data-blocks'

Similar to addons -> add-ons, for reading it fits better to hyphenate.

Node Border Select: only frames inside border

Without this you can't easily select a few nodes inside a frame,
without selecting the whole frame, noted in T46540

Cleanup: use int for view_id's & view count

`size_t` is useful for memory sizes or offsets,
the number of views wont realistically exceed an int.

Correct own error w/ snap-scale T46503

Don't use nan for comparisons.

BGE: Fix T30179 action actuator not stoped when state changed.

The function SCA_IActuator::DecLink is now under virtual : in some case the actuator have to know when is useless.

Quiet audaspace unused macro warnings

Fix ffmpeg memory leaks

- audio_stream wasn't freed.
- audio/video stream + context weren't freed on failure.

Fix ffmpeg saving long paths

Was checking wrong length on string copy.

Fix for error w/ RenderView in ImageView list

Comments for link-list types

Fix snap-scale w/ axis constraint

Related to T46503,
fix only worked when the snap target was axis-aligned.

BGE: Fix T46556: check on null sound datablock pointer.

Version Bump: 2.76.2, deprecate values

- RegionView3D.view RV3D_VIEW_PERSPORTHO
only ever set on initialization, never checked for.
- Lamp.type LA_YF_PHOTON
from old 2.4x yafray files.

Also iniitalize movie-clip + grease-pencil theme colors.

Cycles: Watertight fix for SSS intersection

Same as previous commit, just was missing in there.

Cycles: Fix for watertight intersection

It was possible to miss some intersection caused by wrong barycentric
coordinates sign.

Cases when one of the coordinate is zero and other are negative was not
handled correct.

View3D: make ndof turntable & orbit speed match

BLI_math: axis_angle_to_quat_single

Useful to avoid defining a vector for an axis-aligned rotation.
Matches axis_angle_to_mat3_single behavior.