Added lfrfid protocol EM4100/40/RAW

[hippocache]

This protocol allows users to send 8 bytes (64 bits) of data directly without any encoding.

Added documentation/LFRFID_EM4100_RAW.md

What's new

Sometimes it is useful to send eight bytes of your choosing over, and over again using ASK at 40cs/bit-rate.

Verification

A device such as a proxmark3 should be able to demodulate data as em4100. Try emulating FF80000001234567 while reading with a device like proxmark3.

Checklist (For Reviewer)

• PR has description of feature/bug
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[hippocache]

The SecuraKey LFRFID implementation on OFW (Release 0.103.1, unleashed release 75) , and the LFRFID fuzzer, make this patch irrelevant / unnecessary.

[xMasterX]

The SecuraKey LFRFID implementation on OFW (Release 0.103.1, unleashed release 75) , and the LFRFID fuzzer, make this patch irrelevant / unnecessary.

Not sure what you mean about lfrfid fuzzer,
but the idea of RAW option itself in lfrfid sounds interesting, this one exact implementation was specifically tuned for that system and wasn't universal, so it wasn't accepted in first place, also we do not have that cards to test it with
I asked @Leptopt1los couple times to respond here and explain the issues of this PR
but it never got anywhere than our local messages, sorry for no response here!