[Click] New element: icmpipencap, a general icmppingencap

[Braem Bart]

Dear list,

Attached you will find an element our students (Jens De Wit and Nico Van Looy) produced while working on their FireSim project, the Firewall Simulation in Click as presented on SyClick.
The element allows transmitting ICMP packets with all types of codes and types, which makes this element more general than ICMPPingEncap. It is a bit the ICMP alternative to UDPIPEncap.
The element code is largely based on ICMPPingEncap so Jens and Nico suggested just patching ICMPPingEncap with the new behaviour, although of course the name then does not cover the contents of the element. 
Jens promised to write a unit test with the testie framework, so this can be expected as well.

best regards,
Bart
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