Squashed 'gui/pyqtgraph/' content from commit 26730ad

git-subtree-dir: gui/pyqtgraph
git-subtree-split: 26730ad94757554ffb55411ada41f92cfa175c61
Merge commit '3d29c6f4f27db467dadfd22a4b705af2e90863c8' as 'gui/pyqtgraph'
Update