- Fix a just-introduced issue that node ends up at weird position when removed from research queue.
- Add Alt-Left-Click prompt to the tooltip.
- Remove the click prompt from the tooltip.

Now this mod should enforce the tech-level restriction of medieval storyteller from vanilla faction expanded.

But I don't know if the storyteller does other special things so please give feedback whether this update works.

Fix an issue that some items in the research queue disappear when loading the game.

Fix typos.

Now every research node supports drag and drop interaction with the research queue:
- Drag nodes to the far left or far right or research queue to scroll.
- Drag nodes out to remove from research queue.
- Drag nodes from research tree to research queue to add research (and their prerequisites) at any position.
- Drag nodes in research queue to reorder.

Right click research in research queue to highlight and navigate to the research in the main tree.

New option: Display Indices on Research Queue: draw little index icons on the researches of research queue as well.

Fix: Research queue and research tree overlap at UI scale > 1

Known Issues:

- When zooming out, dragging nodes from research tree may be unresponsive. I haven't found out why, but it seldom happens. And when it does, just scroll up'n down for a little, the issue should resolves itself.
- When zooming far out, dropping nodes on the right side of the screen would be unresponsive. This is because the right side of the UI when zooming far out simply can't receive mouse event due to the zooming implementation.

Now the research queue supports scrolling when the screen doesn't fit the entire queue.

Mouse hovering the research in the queue no longer centralize the node on the screen.

Now you can right-click a node to highlight it without hovering over it.
Right-click again, or click anywhere else to unhighlight it.

Shift + Right Click to highlight multiple nodes without mouse hovering over them.

- Rewrite the legacy layer separation algorithm (including when "group by techlevel" is enabled). Should slightly improve layout generation performance.
- Adds a new option: "Search by Description", default to be false: whether or not the search facility match the keyword against the description of a tech. Original ResearchPal behavior is true.

Remove a bunch of useless legacy code.

- Fix: Now middle-key panning no longer affects the game map.
- Fix: Now arrows are displayed consistently without disappearing and reappearing.