Merge remote-tracking branch 'udb/master'

.github/workflows/continuous_integration_other.yml

Help/e_curvelinedefs.html

Makefile

README.md

Source/Core/Actions/MouseInput.cs

Source/Core/Controls/ImageSelectorPanel.cs

Source/Core/Data/DataManager.cs

Source/Core/Windows/MainForm.cs

Source/Native/RawMouse.cpp

Source/Native/exports.def

...ce/Plugins/BuilderModes/ClassicModes/CurveLinedefsMode.cs

Source/Plugins/BuilderModes/Resources/Hints.cfg