fix: swap allowAbsurdFees for maxFeeRate for Dash Core v18

[coolaj86]

Feedback wanted: What should the default maxFeeRate be?

Re: dashpay/insight-ui#75

[pshenmic]

LGTM

[shumkov]

👍

[coolaj86]

This PR is incomplete.

It took a few days for me to set up a full node to test (33gb of blocks and 50gb of indexes).

Notes for follow up:

node_modules/@dashevo/dashd-rpc/lib/index.js:

- sendRawTransaction: 'str bool bool',
+ sendRawTransaction: 'str float bool',

Re: dashpay/dashd-rpc#50

Even after that change I still get:

Error: "absurdly-high-fee, 383 > 373 (code 256). Code:-26"

Can't figure out where it's coming from.

[coolaj86]

I updated this from feedback on discord that maxFeeRate was a float, but I'm pretty sure it's supposed to be an int.

When I change from 0.00001000 to 1000 that error goes away.

Also need to investigate @dashevo/dashcore-node/lib/services/web.js for socket io stuff...

[shumkov]

@coolaj86 so we need one more PR?

[coolaj86]

All related PRs have been opened.

I've tested locally going over and under the maximum fee.