Touch point visualization

Useful for debugging issues like linux-next#136.

added 9 commits

• 3b7de22c...a4daba97 - 8 commits from branch Librem5:master
• 56bac27d - touch points debug visualization

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apart from the comments although it's wip it doesn't interfere with existing code so we might as well merge it?

Let me finish it up, after separating the iterator and getting colors from some nice HSV circle it should be good to go.

added 2 commits

• 1a6e941e - 1 commit from branch Librem5:master
• b7e3b683 - Touch point visualization

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unmarked as a Work In Progress

changed title from WIP: Touch points debug visualization to Touch point visualization

changed the description

resolved all threads

UnWIPed!

merged

i did not give the new code any actual testing but since it's all guarded by the debug flag let's have it.