Allow customizing formatting of information shown per host

[fujiapple852]

Trippy supports some limited ability to select what information to display for each host in the main table. For example yuo can choose to include different ASN information and to incude the host name and IP address or both

In the hop details view additional information is provided (i.e. GeoIP information, and soon ICMP extension data) and again there is some limited ability customize this display.

It would be nice if users could fully customize both of these displays, perhaps by using a library which allows for synamic/runtime formatting capabilities.