loads and stores opcodes that take scratch slot from stack

[jannotti]

Lots of fixups for not checking unit64 to int casts as well.

[codecov-commenter]

Codecov Report

Merging #2853 (52d6c86) into master (cde7eed) will increase coverage by 0.02%.
The diff coverage is 60.39%.

@@            Coverage Diff             @@
##           master    #2853      +/-   ##
==========================================
+ Coverage   47.28%   47.30%   +0.02%     
==========================================
  Files         351      351              
  Lines       56488    56505      +17     
==========================================
+ Hits        26708    26730      +22     
- Misses      26765    26768       +3     
+ Partials     3015     3007       -8     

Impacted Files	Coverage Δ
cmd/goal/clerk.go	9.11% <0.00%> (ø)
data/transactions/logic/doc.go	82.75% <ø> (ø)
data/transactions/logic/opcodes.go	96.00% <ø> (ø)
data/transactions/verify/txn.go	44.29% <0.00%> (-0.80%)	⬇️
data/transactions/logic/assembler.go	80.66% <34.61%> (ø)
data/transactions/logic/eval.go	88.96% <75.00%> (+0.07%)	⬆️
cmd/tealdbg/local.go	70.50% <100.00%> (ø)
daemon/algod/api/server/v2/dryrun.go	61.79% <100.00%> (ø)
data/transactions/logic/debugger.go	51.42% <100.00%> (ø)
ledger/eval.go	76.82% <100.00%> (ø)
... and 11 more

---

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[algochoi]

Overall looks good to me. Had one comment about naming. Thanks for fixing the txnas related parts 👍

[jasonpaulos]

Looks good