Signal connections window improvment

[filantus]

In a code editor if click on signal connection icon then appears widow with signal connections for function. But there is no any abilities to do except just take a look and quit.

How about to add there to each connection:

1. Ability to select (go to) a node (in scene nodes tree dock) on double click on the connection source.
2. Ability (some button with cross icon for example) to remove this connection right here inplace.