Blender Git Loki

Fix (unreported) looptri array not being recalculated in ccgDM and emDM

In ccgDM and emDM, looptri array recalculation was being handled
directly by `*DM_getLoopTriArray` (`getLoopTriArray` callback), while
`*DM_recalcLoopTri` (`recalcLoopTri` callback) was doing nothing.

This results in the array not being recalculated when other functions
that depend on the array data are called. These functions, such as
`getNumLoopTris`, call `recalcLoopTri` to ensure the data is up to date,
but in the case of CCGDerivedMesh that was doing nothing.

This moves all the recalculation code to `ccgDM_recalcLoopTri` and makes
`ccgDM_getLoopTriArray` call that.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D2375