AVM: Consolidate TEAL and AVM versioning

[michaeldiamant]

Consolidates TEAL and AVM versioning references as requested in #4125.

Diffs produced by:

• Searching for (case insensitive) "teal version", "tealversion", and "teal v" references.
• Reviewing the spec (data/transactions/logic/README.md).

[codecov]

Codecov Report

Merging #4269 (4cdd3cf) into master (315037b) will decrease coverage by 0.05%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master    #4269      +/-   ##
==========================================
- Coverage   55.24%   55.19%   -0.06%     
==========================================
  Files         395      395              
  Lines       50219    50219              
==========================================
- Hits        27743    27717      -26     
- Misses      20101    20120      +19     
- Partials     2375     2382       +7     

Impacted Files	Coverage Δ
data/transactions/logic/assembler.go	85.09% <ø> (ø)
data/transactions/logic/fields.go	77.10% <ø> (ø)
data/transactions/logic/opcodes.go	83.87% <ø> (ø)
protocol/consensus.go	0.00% <ø> (ø)
data/transactions/verify/txn.go	44.00% <25.00%> (-0.89%)	⬇️
data/transactions/logic/eval.go	90.00% <100.00%> (ø)
data/transactions/verify/verifiedTxnCache.go	77.55% <100.00%> (ø)
ledger/blockqueue.go	82.18% <0.00%> (-2.88%)	⬇️
network/wsPeer.go	65.47% <0.00%> (-2.74%)	⬇️
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
... and 6 more

[jannotti]

Looks good

[iten-alg]

Looks good, couple lines that are maybe relevant (if we decide these are I can go find similar ones):
->line 678 of opcodes.go says "v2 TEAL"
->line 17 of rekey.sh says "v2 TEAL"
Sorry I couldn't find a way in github to add suggestions to these lines.

[michaeldiamant]

couple lines that are maybe relevant

@iten-alg Thanks for catching - I updated via 2615784 using git --no-pager grep -P "v\d TEAL" to catch references.