do not set edges of selected faces to sharp in external mode

because in most cases only existing objects are packed into the FM mesh, and no fracturing happens,
where you want to set fracture edges to sharp.

enabled angular limits/stiffness/damping for plastic constraints (uncomment only)

added comments to most functions

Merge branch 'master' into fm_master

compile and link errors fixed

compile fixes done, need to fix linking now

compile fixes part1

Merge branch 'fracture_modifier' into fm_master

fix for cmake failing to detect VS 2017 properly

added ghost stop triggers

stopped shards also will get their constraints disabled and still attached partners will be stopped too

missed in last commit: rise BM_OMPLIMIT to avoid overheads with small datasets

fix a clang warning, fix an improper initialisation for gcc, remove nonfunctional omp, rise BM_OMPLIMIT to avoid overheads with small datasets

crash fix for changing shardcount and refracture when doing automerge

forgot to refresh the merge data before merging, after refracturing

added isIntact() query to regular rigidbody constraints, too

immediately take constraint limit changes into account during rigidbody simulation

fix for setting lower x linear limit

Merge remote-tracking branch 'refs/remotes/origin/blender-v2.79b-release' into fracture_modifier

Fix T54360: FFMPEG bitrate not editable for all codecs

The bitrate selection was hidden when a CRF mode was chosen and then
switched to a codec that doesn't support CRF.

Fix compilation error

Recent fix was assuming some cleanup is done.

Update addons submodule hash