Decode transparent notes amount

[herr-seppia]

Resolves #1292

[codecov-commenter]

Codecov Report

Merging #1296 (bbdba47) into master (828364b) will decrease coverage by 8.64%.
The diff coverage is 48.87%.

@@            Coverage Diff             @@
##           master    #1296      +/-   ##
==========================================
- Coverage   50.51%   41.87%   -8.65%     
==========================================
  Files         145      144       -1     
  Lines        7544     9048    +1504     
==========================================
- Hits         3811     3789      -22     
- Misses       3066     4686    +1620     
+ Partials      667      573      -94     

Impacted Files	Coverage Δ
pkg/config/genesis/config.go	0.00% <0.00%> (ø)
pkg/core/candidate/validator.go	64.00% <ø> (+6.85%)	⬆️
pkg/core/chain/mock.go	9.09% <ø> (+0.75%)	⬆️
...nsensus/blockgenerator/candidate/blockgenerator.go	0.00% <0.00%> (-64.29%)	⬇️
...core/consensus/blockgenerator/candidate/genesis.go	0.00% <0.00%> (-69.24%)	⬇️
...kg/core/consensus/blockgenerator/candidate/mock.go	0.00% <0.00%> (ø)
...ore/consensus/blockgenerator/candidate/testutil.go	0.00% <0.00%> (-90.91%)	⬇️
pkg/core/consensus/comms.go	0.00% <0.00%> (ø)
pkg/core/consensus/fixtures.go	0.00% <0.00%> (ø)
pkg/core/consensus/header/header.go	24.50% <0.00%> (+2.41%)	⬆️
... and 187 more

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[autholykos]

LGTM