Points dragging
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Make it possible to drag points with left mouse-button, will select the points and drag a "ghost" points until the left mouse button is released, then a edit/undo action is created. After I created this I found some discussion about that it might be to easy to move points, this is not addressed in this patch, I made it super-duper-ease since that was how I liked it, maybe this needs some discussions on how it should be handled.
Patch is against 12.1 sources that I found in the downloaded archive.
Let me know if there is any code change/cleaning up or reimplementation that is need, or if any other patch format is needed or anything other to make it more easy to review/integrate it.
Updated the patch to add an "edit mode" icon that is disabled by default, also added a specal key
"Alt" and "Alt Gr" that will be the same as "edit mode" enabled for the advanced users can press it and drag without the need to enable/disable edit mode.
Included in v14