[bisq-network/proposals] Reduce minimum required security deposit (#323)

[m52go]

@HeadyWook this proposal only changes the absolute minimum security deposit. Security deposits will still be determined as a % of trade size. I believe the current permissible range is 15% - 50% (determined by offer maker), but instead of the absolute minimum being 0.006 like it is now, the absolute minimum will be 0.001. 

Examples:
1. 0.01 trade with 15% deposit specified means both traders deposit 0.0015 (~80 USD)
2. 0.01 trade with 50% deposit specified means both traders deposit 0.005 (~270 USD)
3. 0.001 trade - % is superceded by minimum, so both traders must deposit 0.001

Offer makers can adjust the % deposit they prefer to secure the trade, so if (1) isn't acceptable to you, you can do (2) or anything in between.

As for fiat values, the very idea is to handle BTC rate fluctuations better. Values would be pegged in fiat terms but BTC amounts would be calculated right before the deposit is put down. 

Consider this scenario: this proposal is implemented, minimum deposit is reduced to 0.001, and BTC crashes back to 10,000 USD. In this case, the minimum deposit would effectively become 10 USD—major problem. But with a pegged USD value, such BTC rate fluctuations wouldn't matter...deposits would always be calculated so that both peers would always have a reasonable amount of skin in the game (e.g., if minimum deposit is set to 50 USD, 0.005 BTC would be required at 10,000 USD/BTC and 0.001 BTC would be required at 50,000 USD/BTC) for smaller trades where percent-based deposits are too small. 

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