Feature merge priority queue

[adrianbrink]

This is a proposed feature priority and merge (or equivalent) order. Each sub-topic has an owner. If you are listed as the owner, you are responsible for merging (and please ask for help - but don't block on anyone else or wait for anyone else's approval if you can't contact them). If you are later down in the queue, please start preparing your branch by updating it against everything which has been merged so far, so that you're ready when we get to you.

• Remaining minor SDK changes for the interface (owner: @mateuszjasiuk)
  • SDK changes to help the interface #1238
• HD derivation support (owner: @karbyshev)
  • Wallet bip39 / bip32 / bip44 support #1110
• Signing changes (owner: @murisi)
  • Moving inner_tx from WrapperTx to Tx. #1093
  • Murisi/restructure tx #1280
  • Murisi/restructure tx merge #1313
• Amount refactor (owner: @mariari)
  • Make the the backing integer type for amounts 256 bit #1282
• Ethereum bridge (owner: @sug0)
  • Tiago's integration branch #1337
  • Added erc20 token amount type #1233
• Proof-of-stake (owner: @brentstone)
  • Implement cubic slashing #892
  • Apply rewards to voting powers #1168
• PGF & Multisig (owner: @Fraccaman)
  • ledger: Multisignature #1273
  • ledger: pgf #1336
  • Add docs for multisig #1341
• Gas and fee updates (owner: @grarco)
  • Whitelist gas accounting #1242
  • Fee unshielding #1281
  • Gas & Fee #1327
• MASP rewards (owner: @mariari)
  • Handle native inflation rewards for native tokens #1198
  • Shielded Inflation rewards #1025
• Misc (could be merged earlier if convenient)
  • pre-genesis wallet #870
  • Add reusable token balance query method #1173
  • pos: add a query to find validator by Tendermint address #1344
  • Fix Key from always parsing (do not rename ("Key" is the name of a struct, which is upcased)) #1345