Query fixes and refactoring

[td202]

Purpose

Fixes #1176 - GetBakersRewardPeriod gives incorrect data
Fixes #1177 - GetPoolInfo reports incorrect commission rates

Changes

• Base is updated. Some TODOs are inserted where support for AccountV3 is not implemented. The basic account release schedule for AccountV3 is defined the same as for AccountV2.
• GetPassiveDelegationStatus is separated out from GetPoolStatus functionality.
• getBakersRewardPeriod uses the "current payday" baker information
• doGetPoolStatus is revised to get the correct information.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.