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D1002 by @plasmasolutions, with own refactoring.

Note, needed to do a bad-level call here (IMB -> BLF)
Also can't use the BLF API directly because its not thread-safe.
So keep the function isolated (blf_thumbs.c).

BLF: use regular unsigned int's

So GL isnt needed to include BLF types.

Cleanup: IMB/thumb naming

BLF: Fix clamping drawing into byte buffer

Muliview: Minor UI-tweaks

* Don't grey multiview options in file browser and in Node Editor Properties out if multi-view is disabled, hide them completely (I think greying out single buttons is fine, but in case of entire blocks we should just hide to save space)
* Move multiview settings in Node Editor Properties above alpha settings to prevent the alpha buttons from appearing above multiview settings if multiview is enabled and Stereo 3D format is chosen (making them appear below is much nicer)

Fix T44290: Clear users & fake-user conflict

The purpose of clearing users in this case is not to save the data,
so keeping fake-user doesn't make sense.

BGE: use tuple for returning display size

Cycles: Cleanup, typos

Multiview: compositor - avoid trashing image viewer views/buffers when multiview is off

I found this while investigating why the backdrop shows 'blank' while I
update a node influence factor. This problem still persist, but maybe it
was there before multiview. In release it is not noticeable, but in my
debug build is quite evident.

Multiview: compositor was not updating when multiview was off

Proportional editing support for the action editor.

There are a few things here which are not so nice:

* Position of proportional edit circle is not centered on data
(difficult to predict positions here since those are completely custom,
will probably be positioned at center of area later instead)

* Result is flushed to curve handles only at the end of the transform,
so if people have the graph editor open they will see handles lagging behind.

Multiview: update Set Stereo 3D menu when the selected stereo mode changes

Cycles: Cleanup, indentation

BGE: New API method getDisplayDimensions

This patch adds a new API function to get the actual display dimensions in pixels.

Reviewers: dfelinto, sybren, lordloki, moguri

Reviewed By: lordloki, moguri

Differential Revision: https://developer.blender.org/D648

Fix crash when changing proxy storage type for editing (was own
stupidity casting from Scene to Editing in RNA)

Move versioning for proxy storage to multiview version check (not really
correct but it was orphaned before and it doesn't hurt either).

Revert Sticky Keys (and everything related to that)

Our current keymap doesn't give us enough room to make such changes in
the event system. To fix small issues caused by this, we would need to do
drastic changes in Blender's keymaps and internal handling. It was worth
a try, but it didn't work.

I can write down a more descriptive statement in a few days, but for now
I need a break of this stuff.

Fix for own last commit

resolved bug but wasn't correct

Make image strips also follow the project directory storage options.

Fix T44258: Can't select similar regions

Fix T44268: Particles: too many virtual parents + non-100 display% = crash

Issue was caused by mismatched logic in counting child/parent particles in
job initialization and actual job execution. Confusion here came from mixed
usage of psys->renderdata and G.is_rendering.

We need to get rid of G.is_rendering and use eval_ctx if it's really needed,
but we also might just use psys->renderdata check since it's expected psys
to have this structure anyway.