the reward distribution contract currently suffers a bug where reward distribution intervals are delayed each time a voting power change occurs.

this is due to the fact that integer division is used to make it so that only increments of the linear emission rate duration are distributed. when a voting power change occurs before one interval has passed, it calculates 0 new rewards distributed and updates the last updated timestamp, which effectively restarts the interval timer.

for example, if you distribute 100 tokens per hour:

• at minute 0, timer starts counting
• at minute 30, member stakes more tokens, and timer restarts
• at minute 60, nothing happens
• at minute 90, first distribution occurs

this PR fixes it so that it uses decimal math when counting the intervals that have passed since the last update in order to update the rewards distributed.

this also adds a force withdraw execution message to allow the contract owner to recover locked funds, since the delayed funds are likely stuck in the contract.

recover delayed/locked rewards

i think the ideal way to remedy this is:

• pause all distributions
• withdraw all undistributed funds from the distributions
• upgrade the contract to fix the partial-interval distribution and add the force withdraw message
• calculate the missed rewards by looking at what's left over in the contract and then looping through everyone's pending rewards and subtracting those from the left over amounts
• force withdraw that unaccounted for amount, leaving all pending rewards that were successfully distributed intact
• restart the distributions and fund them again

this way the state should be reset to account for the pending rewards that were allegedly distributed, and you can manually withdraw any funds beyond that amount before restarting and refunding.