Update pending-opcodes.md (DATA*, RETURNDATALOAD, EXCHANGE)

[pdobacz]

What was wrong?

Related to Issue ipsilon/eof#43. Two opcodes proposed for EOF are in conflict (EXCHANGE and DATALOAD)

Also, EXCHANGE and RETURNDATALOAD proposed by Mega-EOF spec and their respective EIPs were missing, so adding them in as well.

Various EOF-related opcodes were out-of-date in the proposed-opcodes.md.

How was it fixed?

Conflict resolved by moving all DATA* opcodes to the currently empty D section (ipsilon/eof#46).

EXCHANGE and RETURNDATALOAD added,

proposed-opcodes.md updated to match pending-opcodes.md

[gumb0]

Please update also proposed-opcodes.md

[gumb0]

Also add EXCHANGE and RETURNDATALOAD.

[pdobacz]

@gumb0

Please update also proposed-opcodes.md

Also add EXCHANGE and RETURNDATALOAD.

Done & done, please double check

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (559ba54) 74.11% compared to head (702845e) 74.11%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #868   +/-   ##
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  Coverage   74.11%   74.11%           
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  Files         572      572           
  Lines       32411    32411           
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  Hits        24022    24022           
  Misses       8389     8389           

Flag	Coverage Δ
unittests	74.11% <ø> (ø)

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[SamWilsn]

Suggested change

	| 0xED | CREATE4 | Create from transaction contained initcode | [EIP-7620](https://eips.ethereum.org/EIPS/eip-7620) |
	| 0xED | TXCREATE | Create from transaction contained initcode | [EIP-7620](https://eips.ethereum.org/EIPS/eip-7620) |

Maybe?

[pdobacz]

I didn't want to bloat and delay this one. There's going to be yet another update soon (EXT*CALLs), but I want to wait a few days until dust settles and the new names are stable in the EIPs.

But thanks for spotting 👍