Blender Git Loki

Fix slow .blend file load due to recent accidentally committed debug code.

Set active base to NULL if its object is gone

Depsgraph: Cleanup, make it more obvious what ID references

Depsgraph: Cleanup, make it more clear what function does

Depsgraph: Generalize storage for already existing ID nodes

Currently no functional changes, just allows to store mo information.

Cleanup: Remove unused lay_updated

Is no longer used, having it around was more of a confusion than
anything else.

Depsgraph: Cleanup, indentation level

Fix Cycles half float pragma for strict OpenCL compilers (like ROCm).

Differential Revision: https://developer.blender.org/D3669

Fix T56659: Flow UI: Checkboxes report wrong width, making layouts jump to multi-columns too soon.

Wrong handling of ideal width when splitting buttons and labels appart
for checkboxes...

Cleanup: warning

GP: Cleanup function parameter

There was a mix of enum parameters and int/bool values.

Fix exception running toolbar w/o an active space

Cleanup: use single quotes for enum's

UI: remove rotate/reverse UV's from menu

These are quite obscure operations and are already available in the
"Face Data" menu.

UI: disable key shortcuts for tools

Only show shortcuts in the tooltips since they use different logic.

Cleanup: replace __import__ w/ import argument

PyAPI: add optional imports to expression eval API

Avoids having to use `__import__` to access modules.

Merge branch 'master' into blender2.8

Tool System: Show popup accelerators in tooltip

The tooltips for tools in the toolbar now show how to access.

Tool System: map keys bound directly to a tools

If a key is bound to activate a tool in the tool-system,
add this to the popup keymap.