Blender Git Loki

Correction to last commit

BLI_stackdefines

Bounds check the stack while debugging, also add STACK_PEEK

Cycles: use SYSTEM for external includes

Add render result caching.

Simply add an option to render settings to save an EXR cache,
just when the render is finished. Also changed RE_ReadRenderResult() to read
cache instead of temp sample files (those are fully volatile now anyway).

Path to save cached render results is an UserPreferences setting.

Also added 'Reload render' feature to the Image Editor (so one can now re-open a blend,
and in an Image Editor hit ctrl-R to (try to) reload last render from cache).

Reviewers: campbellbarton, sergey

Differential Revision: https://developer.blender.org/D553

Fix T40851: "Sequencer" auto-check after changing spaceview and scene.

Mere typo, leading to restore a flag from another scene's flag value...

BLI_stack: use strict flags
also use size_t, rename BLI_stack_empty

Cleanup: typo

CMake: update source files

Fix 40841: Copy and Paste objects no longer functions from one running instance of Blender to another.

Own mistake in recent temp data handling refactor, copy/paste temp .blend file needs to
be in non-session-specific temp dir...

Fix T40797: Crash on render on specific file with volumentrics and 'use hair' clicked on render layer

UI: increase contrast for active colorband handle

UI: use cursor x-location for tooltip placement (T37478)

BMesh: more edits to vertex dissolve, handle mixing wire edges with faces better

Get rid of usage of non-existing module

warning fix: use of __restrict was inconsistent in BLI_dynstr between declaration and definition

Fix T40834, grab brush not working after recent jittering fix.

Some brushes do not require location always. Made a list here, there may
be others but I think this pretty much covers this.

BMesh: tweaks to dissolve, remove wire edges before other calculations

also avoid feedback loop when checking topology giving nondeterministic results.

BMesh: add BM_vert_is_edge_pair(), faster then checking (BM_vert_edge_count(v) == 2)

BMesh: add ability not to delete vertex when collapsing

BMesh: use slightly faster method of stepping over edge-disks