Change forwarder proxy bytecode to ERC-1167

[fubuloubu]

What I did

fixes: #2269

How I did it

Copy some stuff

How to verify it

• Manual inspection
• Deploy to Etherscan and verify proxy working

Description for the changelog

Updated forwarder proxy bytecode to ERC-1167 compliance

Cute Animal Picture

[codecov-io]

Codecov Report

Merging #2281 (b1bf214) into master (4ac9e49) will increase coverage by 0.34%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #2281      +/-   ##
==========================================
+ Coverage   85.44%   85.79%   +0.34%     
==========================================
  Files          84       85       +1     
  Lines        8591     8546      -45     
  Branches     2075     2036      -39     
==========================================
- Hits         7341     7332       -9     
+ Misses        748      730      -18     
+ Partials      502      484      -18     

Impacted Files	Coverage Δ
vyper/functions/functions.py	89.25% <85.71%> (-0.17%)	⬇️
vyper/parser/parser.py	81.17% <0.00%> (-6.06%)	⬇️
vyper/parser/global_context.py	71.83% <0.00%> (-5.95%)	⬇️
vyper/context/types/meta/event.py	77.58% <0.00%> (-5.03%)	⬇️
vyper/compiler/output.py	97.08% <0.00%> (-2.92%)	⬇️
vyper/signatures/sig_utils.py	97.14% <0.00%> (-2.86%)	⬇️
vyper/parser/context.py	93.25% <0.00%> (-2.79%)	⬇️
vyper/parser/parser_utils.py	79.77% <0.00%> (-1.65%)	⬇️
vyper/compiler/phases.py	94.44% <0.00%> (-1.07%)	⬇️
vyper/parser/expr.py	77.18% <0.00%> (-0.64%)	⬇️
... and 24 more

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[iamdefinitelyahuman]

I believe the logic here is good to go, just some tests need updating.

[fubuloubu]

It works!
https://ropsten.etherscan.io/address/0xC2fD8102A9d46d332acFdF28e725BC2a2375B70E#code