Adds header and footer attributes and traits#106

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JomerDev wants to merge 8 commits intohashmismatch:masterfrom

JomerDev:prepend-and-append-data

Commits on Oct 12, 2023

Added prepend attribute
JomerDev
committed

Commits on Oct 13, 2023

Commits on Oct 14, 2023

Add UserError only with feature std
JomerDev
committed

Commits on Nov 13, 2023

Support empty structs with header or footer set
JomerDev
committed
Merge branch 'prepend-and-append-data' of github.com:JomerDev/packed_struct.rs into prepend-and-append-data
JomerDev
committed