Refactoring v0.11 into v0.11.1 in style of v0.12 simplifications

[dr-orlovsky]

This PR by Bitfinex team summarizes their 4-month work on making v0.11 as simple as possible, including taking many ideas from v0.12 (seal unification, monimorphisation of contracts over specific underlying chain; state unification, removal of Pedersen commitments etc)

[codecov]

Codecov Report

Attention: Patch coverage is 4.58265% with 583 lines in your changes missing coverage. Please review.

Project coverage is 9.8%. Comparing base (52592c6) to head (9267913).

Files with missing lines	Patch %	Lines
src/validation/validator.rs	0.0%	135 Missing ⚠️
src/schema/schema.rs	0.0%	88 Missing ⚠️
src/validation/logic.rs	0.0%	76 Missing ⚠️
src/vm/op_contract.rs	0.0%	72 Missing ⚠️
src/operation/assignments.rs	0.0%	70 Missing ⚠️
src/operation/layer1.rs	0.0%	37 Missing ⚠️
src/operation/bundle.rs	6.5%	29 Missing ⚠️
src/vm/contract.rs	0.0%	19 Missing ⚠️
src/validation/schema.rs	0.0%	16 Missing ⚠️
src/operation/operations.rs	0.0%	11 Missing ⚠️
... and 9 more

❌ Your patch check has failed because the patch coverage (4.6%) is below the target coverage (60.0%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #288     +/-   ##
=======================================
- Coverage    14.1%   9.8%   -4.3%     
=======================================
  Files          29     27      -2     
  Lines        3948   2674   -1274     
=======================================
- Hits          558    262    -296     
+ Misses       3390   2412    -978     

Flag	Coverage Δ
rust	9.8% <4.6%> (-4.3%)	⬇️

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