RNA: expose the pin flag for AnimData and ActionGroup

Fix missing Surface Deform strength versioning

UI: Fix text padding for labels without an icon

Cleanup: remove DNA_view2d_types.h from DNA_sound_types.h

Screw Modifier: support 1-2 steps

The Screw Modifier had a lower limit for the steps value, which not only
was inconsistent between render and viewport steps, but also was capped
to 2 in UI and also in the code internally.

Fix warp modifier using pose matrix without object matrix applied

Error in recent patch D6820

Fix T72075: Incorrect Grid Fill error message

Cleanup: remove unicode character printing

Was added when utf8 was originally introduced - for testing,
but is no longer needed.

Cleanup: spelling, comments

Cleanup: strict-prototypes warning