vm: remove crypto-related opcodes

[fyrchik]

All cryptography has moved to interops in NEO3.
There is no SHA256 interop RN, but it is to appear later.

[codecov]

Codecov Report

Merging #917 into master will increase coverage by 0.70%.
The diff coverage is 64.24%.

@@            Coverage Diff             @@
##           master     #917      +/-   ##
==========================================
+ Coverage   63.45%   64.15%   +0.70%     
==========================================
  Files         196      194       -2     
  Lines       16534    16258     -276     
==========================================
- Hits        10492    10431      -61     
+ Misses       5502     5296     -206     
+ Partials      540      531       -9     

Impacted Files	Coverage Δ
pkg/compiler/analysis.go	95.80% <ø> (ø)
pkg/config/protocol_config.go	70.00% <ø> (+6.36%)	⬆️
pkg/core/gas_price.go	100.00% <ø> (+8.00%)	⬆️
pkg/core/interop_neo.go	59.58% <ø> (-0.58%)	⬇️
pkg/core/interops.go	100.00% <ø> (ø)
pkg/core/state/account.go	95.52% <ø> (-0.43%)	⬇️
pkg/core/storage/store.go	42.30% <ø> (ø)
pkg/core/transaction/transaction.go	82.25% <ø> (+1.09%)	⬆️
pkg/core/transaction/type.go	72.97% <ø> (-10.71%)	⬇️
pkg/interop/crypto/crypto.go	0.00% <ø> (ø)
... and 38 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c1aa96d...519b31a. Read the comment docs.

[roman-khimov]

Closes #777?