point-coincident constraints and the entity- or group-generated constraints. Also fix a bug where a dragged point was not released when the mouse pointer left the window. [git-p4: depot-paths = "//depot/solvespace/": change = 2045]
what's hovered to the grid. [git-p4: depot-paths = "//depot/solvespace/": change = 2042]
This creates mouse.cpp and confscreen.cpp. [git-p4: depot-paths = "//depot/solvespace/": change = 2040]