Compositor: Add Anti-Aliasing node

This is an implementation of Enhanced Subpixel Morphological Antialiasing (SMAA)

The algorithm was proposed by:
Jorge Jimenez, Jose I. Echevarria, Tiago Sousa, Diego Gutierrez

This node provides only SMAA 1x mode, so the operation will be done with no spatial
multisampling nor temporal supersampling. See Patch for comparisons.

The existing AA operation seems to be used only for binary images by some other nodes.
Using SMAA for binary images needs no important parameter such as "threshold", so we
perhaps can switch the operation to SMAA, though that changes existing behavior.

Notes:
1. The program code assumes the screen coordinates are DirectX style that the
vertical direction is upside-down, so "top" and "bottom" actually represent bottom
and top, respectively.

Thanks for Habib Gahbiche (zazizizou) to polish and finalize this patch.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D2411

Cleanup Compositor AA: remove redundant initialization

Cleanup: use one class for edge detection in Anti-Aliasing node

Merge remote-tracking branch 'origin' into compositor-anti-aliasing

Automated testing: selection operators test cases

added 22 more test cases for following operators:
- edges select sharp
- loop multi select
- select all
- select faces by sides
- select interior faces
- select less
- select linked

{F9853218}

Reviewed By: calra, mont29

Differential Revision: https://developer.blender.org/D10400

Compositor automated testing

Added support for compositor tests. Compositor tests can be added, executed and viewed in a similar way to cycles
and other render engines tests.

Running test:
`ctest -R compositor`

Updating test:
`BLENDER_TEST_UPDATE=1 ctest -R compositor`

Viewing test results:
typically saved under `build_folder/tests/compositor/report.html`

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6334

Merge remote-tracking branch 'origin' into compositor-anti-aliasing

Conflicts:
source/blender/blenlib/intern/math_base_inline.c

Cleanup: replace NULL with nullptr - use brackets around if

Merge remote-tracking branch 'origin' into compositor-anti-aliasing

Compositor Anti-Aliasing: addressed comments from code review

- Made node slightly larger to make text fit
- Renamed "Local Contrast Adaptation Factor" to "Contrast Limit"
- Removed unused enum
- Style: added brackets around if
- Style: Ran make format (excluded changes from unrelated files)