Implement standalone RLP encoding for uint64 to decouple from EVM state

[AbhinavMir]

potential fix #783

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (e4bcf7c) to head (285a4d5).
Report is 328 commits behind head on master.

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HEAD has 2 uploads less than BASE

Flag	BASE (e4bcf7c)	HEAD (285a4d5)
unittests	1	0
statetests-silkpre	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #815       +/-   ##
==========================================
- Coverage   97.79%   0.00%   -97.80%     
==========================================
  Files         110      18       -92     
  Lines       10822    1361     -9461     
==========================================
- Hits        10583       0    -10583     
+ Misses        239       0      -239     

Flag	Coverage Δ
blockchaintests	59.88% <ø> (ø)
statetests-silkpre	?
unittests	?

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see 108 files with indirect coverage changes

[chfast]

No, this does not look good at all. This code doesn't even build.

The job is to copy rlp:: utils here and trim it to what is needed for computing the create address. Which is: encode uint64_t number, encode the 20-byte address, and finally the RLP list of these two.