Swap connections

[Linas]

For tools that have 2 input or output anchors, the ability to right-click the tool and select "swap connections" to swap the connections coming out of the 2 input or output anchors. Let's say, with 5 connections coming out of the Unique's U Anchor and 3 coming out of the D anchor, we need to disconnect and reconnect connections 8 times in order to switch everything between U and D. Even if the tool has 1 connection per anchor, this would still be faster than removing + connecting each connection manually. Tool examples include Append data, Join, Unique, Macros with 2 inputs or outputs, etc.