[feature]Add a switch not to jump to declare when double click something.

[MG1937]

Add a switch not to jump to declare when double click something.
Every time when I double click some object(such as a var or class name),it just auto jump to the declare.
It's really annoy when I trying to copy something:(
Every time I trying to copy some var name,suddenly the content of the screen just changed,break my mind again and again.....

[skylot]

@MG1937 done.
I add option Enable jump on double click in Other preferences group. Check latest unstable build.
Anyway, to copy name under cursor you don't need to select text, you can just press Ctrl+C (added in #1292).