Post v6 cleanup

[mappum]

This PR prunes all legacy state format fields, and upgrades to a version of orga which has done the same.

[codecov-commenter]

Codecov Report

Merging #189 (879dd0e) into develop (2885eba) will increase coverage by 0.30%.
The diff coverage is 0.00%.

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@@             Coverage Diff             @@
##           develop     #189      +/-   ##
===========================================
+ Coverage    14.46%   14.76%   +0.30%     
===========================================
  Files           22       22              
  Lines         6293     6165     -128     
===========================================
  Hits           910      910              
+ Misses        5383     5255     -128     

Files Changed	Coverage Δ
src/airdrop.rs	42.97% <0.00%> (+5.15%)	⬆️
src/app.rs	2.06% <ø> (ø)
src/app/migrations.rs	0.00% <0.00%> (ø)
src/bitcoin/checkpoint.rs	10.07% <0.00%> (+0.43%)	⬆️
src/bitcoin/header_queue.rs	76.60% <0.00%> (+0.44%)	⬆️
src/bitcoin/mod.rs	17.00% <0.00%> (+0.40%)	⬆️
src/incentives.rs	0.00% <0.00%> (ø)

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