- Fix a corner case in research queue sanity check.

- Ctrl + Z to undo the last change of research queue.
- Ctrl + R to redo

Fix an inconsistency of research queue when the research project is changed by other means other than normal research.

Credit: Avil / CGFighter

Fix:
- Dragging Display Delay setting saves correctly
- Regenerate Research Layout no longer causes the cut off of research tree.

Confirmed an issue with the regenerate layout button in the setting.
Retract the feature for now.

Adds three options to adjust:
- scrolling speed
- zooming speed
- dragging display delay

Fix an issue when alt or shift clicking an item in the queue causing a tech to be at a weird position.

Add a button in mod setting to regenerate research layout. (Affecting options that originally require game restart)

Reverse a change of method name avoiding breaking compatibility patch from Human Resource.

- Slightly tune up the display delay of node dragging. (When dragging a node in the tree, you don't have to wait for the dragged node to show up, just slide your mouse to the destination and it should be good)
- Dragging will not trigger when holding shift or alt.