Graph optimize

[karliss]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've updated the documentation with the relevant information (if needed)

Detailed description

Add optional placement optimization pass which tries to push everything together and ignores the grid after. See details in the code documentation. It gets applied to wide narrow and medium modes.

The gridAAA, gridAAB, gridABA, ... modes were added mostly for preparing the comparison shots and choosing which configurations to expose as narrrow, medium, wide. They are not shown in release mode.

Test plan (required)

• Look at a bunch of different functions in graph view using .
• Switch between horizontal and vertical layout 4 times, make sure arrow direction is correct
• Open graph options, change each spacing to unique value, reopen settings make sure values are correctly restored

Here are some before and after comparison.

Closing issues

[karliss]

Remaining work

• increasesing horizontal block spacing causes edges to be moved to the side. Might be caused by mixup between block and edge spacing.
• opening graph settings doesn't proprerly load saved graph spacing settings
• choose which of the 8 modes to expose. Test code added.
• update dimensions
• arrow direction sometimes not switched when switching between horizontal and vertical direction