[Highlighters]: add copy/paste functionality and some hotkeys

[PetbkA]

I have a big "common" set of highlighters (HLs) were there are lots of HLs. Particularily there's "error" HL, which sometimes highlights "non-erroneous" lines like "errorCode = 0" and so on.

To make it highlight such lines as the usual ones, I have to:

1. Create a new "errorCode = \d+" HL;
2. Set up a colors for it;
3. Move it higher than "error" HL.

The problem is that:

1. I have to do steps 1 and 2 from the scratch, i.e. set foreground and background colors, which I have to recall first;
2. As the new HL is placed to the bottom, I have to press "Up" button to raise it, using mouse, and have to do it many times (I have several dozens of HLs).

That's why I suggest to:

1. Add copy/paste functionality to be able to just copy and paste the HL. Ctrl + C/Ctrl + V hotkeys and pasting to another HL sets should work as well;
2. Add some hotkeys to change HL's priority (e.g. Alt + atrow). Pressing and holding it should repeat the action until releasing the keys