Coloring improvements to iproute2 commands

[hexchain]

This change includes some coloring improvements to iproute2-family commands.

ip route:

• improved contrast of "default" labels by using reverse video effect
• darken "broadcast" and "multicast" labels

After | Before:

ip neighbour:

• fixed coloring of neighbour states (at least in iproute2 6.9.0 there is a space character at the end of each line)
• added coloring for mac addresses

After | Before:

ip rule:

• added coloring for ip rule