Add global control over disabling high-resolution smoke draw

Can be found in the viewport's simplify panel, allows to easily
disable high-res display for all the smokes in the scene.

Cleanup: Naming, BKE prefix

Done for smoke functions.

Smoke modifier functions seems an oddballs here,
but probably also to be renamed.

Cleanup: More obvious name for the flag

Not sure what BIG is, it is HIGH RESOLUTION.

Cleanup: Line wrapping

Depsgraph: Speedup constraint source lookup

Is mainly used by drivers variables. The slow part was about
iterating over all pose channels to find the one which has a
given constraint.

Now we build a look up table, so this operation is way cheaper,

Brings down relations update time from 0.7sec to 0.4 with Spring
production file.

Depsgraph: Correct logging of build time

Depsgraph: Move RNA lookup to an own query class

Currently should have no functional changes, but allows to
implement runction optimizations more localized and easily.

Cleanup: Indentation

Depsgraph: Show build time on --debug-depsgraph-time

Previously was only shown on --debug-depsgraph-build which
had other unwanted noise.

Fix Spring characters being in the rest pose on file open

This partially reverts bf2c5217 and makes it so animation is evaluated
for datablocks which were never evaluated within the dependency graph.

Not ideal, but safest way currently.

Animation for already evaluated datablocks will only be evaluated on
manual edits, so the initial bugfix is still valid.