Payload length checking, error rework & rust fmt pass

[JulianSchmid]

No description provided.

[codecov]

Codecov Report

Patch coverage: 99.86% and project coverage change: -0.35 ⚠️

Comparison is base (2607000) 99.62% compared to head (698e9ef) 99.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   99.62%   99.27%   -0.35%     
==========================================
  Files          51      114      +63     
  Lines       21945    29196    +7251     
==========================================
+ Hits        21863    28985    +7122     
- Misses         82      211     +129     

Impacted Files	Coverage Δ
etherparse/src/internet/ip_number_impl.rs	100.00% <ø> (ø)
etherparse/src/packet_decoder.rs	99.89% <ø> (ø)
etherparse/src/packet_filter.rs	100.00% <ø> (ø)
etherparse/src/packet_slicing.rs	99.90% <ø> (ø)
etherparse/src/test_gens/mod.rs	100.00% <ø> (ø)
etherparse/src/test_packet.rs	100.00% <ø> (ø)
etherparse/src/transport/icmp_echo_header.rs	100.00% <ø> (ø)
...se/src/transport/icmpv4/dest_unreachable_header.rs	100.00% <ø> (ø)
etherparse/src/transport/icmpv4/mod.rs	100.00% <ø> (ø)
...e/src/transport/icmpv4/parameter_problem_header.rs	100.00% <ø> (ø)
... and 104 more

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