Create a user settable text and background color for connecting nodes

[tsawyer]

This feature would allow the user to add the colors of their choice to nodes in connecting status to quickly visualize permanent connections that fail. Default colors could be same a connected node.

Allmon2 example:

[jxmx]

/* Node connection table stats=Connecting colors */
--am3-conntable-conn-noconn-color: rgba(0,0,0,1);
--am3-conntable-conn-noconn-bg-color: rgba(255,255,255,1);