New Treasury reward module updates

[drewstone]

Description

This PR adds new, documented logic to the treasury reward module with more tests and compatibility at the time-travel commit. The functionality changes are:

• Enabling splitting the existing treasury reward between potential recipients that are voted in and removed through governance votes (council or democracy).
• Event firing for all changes to the parameters in the system
• Minimum and maximum reward percentages for the Treasury and recipients to ensure that there are limits to the system's capabilities and potential abuse.