Release v2.2.x

[csanti]

I suggest introducing the following 3 main features:

1. First round of preparations for Astroport migration (#80)

• Update collector to be able to change the MIR/UST pair (since it will be the first pool to be migrated)
• Add a LP token deprecation mechanism to staking contract

2. Allow governance voters to execute migrations with a new admin_manager contract (#81)

• New admin manager contract to execute contract migrations
• Admin manager contract integrated with governance
  • Ability to have different poll types with different parameters
  • Fast track polls to execute emergency migrations

3. Integrate with the new oracle contracts (#81)

Mirror will be using a new set of oracle contracts TeFi Oracle contracts that will allow easier integrations with different price sources such as Band Protocol or Chainlink.

• Whitelist process updated to work with the new oracle contracts
• No longer rely on feeder address to migrate, revoke or trigger IPO events
• Now preIPO assets need to specify a trigger address authorized to execute the IPO trigger on mint contract
• Collateral oracle and other price dependent contracts now query prices form the new oracle using the timeframe constrain feature

Migrations

Feature 1 will be added before 2 and 3, that is the reason why staking contract still depends on deprecated oracle.
Since Astroport and Terraswap share the relevant interfaces, no package update yet.
Another release will be needed when all mAsset pools are migrated to Astroport, to update the dependency as well as the whitelist process.

[csanti]

Tag 2.2.0b to be deployed on Testnet:

• Collector (use Astroport pair to swap MIR)
• Staking (Add deprecation feature and trigger MIR pair deprecation)

[yun-yeo]

LGTM