Tighter peg when collateral price rises and settlement fund is not empty or settlement order exists

[abitmore]

PR for #2591.

Changes:

• When BSRM is global_settlement
  • [x] when paying a forced-settlement from the global settlement fund, pay at margin call order price when applicable
• When BSRM is individual_settlement_to_fund
  • [x] when paying a forced-settlement from an individual settlement fund, pay at margin call order price when applicable
• When BSRM is individual_settlement_to_order
  • [x] store total collateral amount and debt amount in the ~settled-debt order~ (updated in #2748) individual_settlement_debt and individual_settlement_fund fields in bitasset object NOTE: This may break client applications which rely on the old logic "individual_settlement_debt and individual_settlement_fund are always zero when BSRM is individual_settlement_to_order".
  • [x] update order price on new feed / expired feed / updated price feed producer list / updated asset or bit-asset parameters, then check whether the order can be matched as taker after finished processing margin calls, if yes, process funds. Note: no action is done on hard-fork time.
  • [x] when the settled-debt order is matched as maker, process funds

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
6 Code Smells

91.2% Coverage
0.0% Duplication