Compositor: Migrate most nodes to new socket builder API

This patch leaves a out a few nodes:

- Group Nodes
- Image input node
- File output node
- Switch View
- Cryptomatte

These nodes above are a bit more complicated and should be worked on individually.

Differential Revision: https://developer.blender.org/D13266

Create generic modal functions from GRAPH_OT_decimate

This patch extracts the modal functions from GRAPH_OT_decimate
and makes them generic so they can be reused by future operators

Reviewed by: Sybren A. St�vel
Differential Revision: https://developer.blender.org/D9326
Ref: D9326

Cleanup: Use LISTBASE_FOREACH macro

Cleanup: Use references in node editor, other improvements

This helps to tell when a pointer is expected to be null, and avoid
overly verbose code when dereferencing. This commit also includes
a few other cleanups in this area:
- Use const in a few places
- Use `float2` instead of `float[2]`
- Remove some unnecessary includes and old code
The change can be continued further in the future.

Cleanup: Remove unused code

This is very old and is unlikely to be useful in the near future.

Cleanup: Const, use references, C++ types

Also remove some unnecessary includes

Cleanup: Comments and ordering in node editor header

Cleanup: Use typed enum for node resize direction

Removed missing file from cmakelists.txt

Cleanup use Tile drawing for wrap repeat.