Blender Git Loki

adaptive_cloth: Store previous frame mesh information for remeshing

The modifier stack doesn't give the previously evaluated `Mesh`, this
means it needs to be stored within the `ClothModifierData`.

Some parts of the cloth modifier copy information from the given
`Mesh` to the `clothObject` every frame, this should not happen when
remeshing is on.

In `BKE_cloth_remesh()`, must use the previous frame mesh if available
for remeshing.

TODO: In case the user goes back a frame, must make the
`clmd->prev_frame_mesh` invalid otherwise the simulation will not know
that the simulation must be restart.