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Fix T72213: F-Curve animation does not update FreeStyle properties

FreeStyle line styles were not part of the dependency graph, and
blacklisted from the Copy-on-Write system. As a result, animated
FreeStyle properties would not be updated by the animation system,
resulting in T72213. There was an explicit call to run the animation
system on the original datablocks, but that was (for good reasons)
removed in D5394.

This commit adds the FreeStyleLineStyle datablocks to the dependency
graph and allows them to be handled by the CoW system. As a result

- the UI now updates properly when properties are animated, and
- animated property values are actually used when rendering.

This commit includes @Sergey's patch P1222, which unifies two bits of
code that did the same thing: check whether datablock type is covered by
copy-on-write.

Reviewed By: sergey, brecht

Differential Revision: https://developer.blender.org/D6609