Powerup rename

[deckb]

Change Description

This is a renaming of rentbw to powerup per the request of the PBE team. These changes are mostly cosmetic renaming of tables and actions. There is also a commit of a new configuration and usage guide.

Deployment Changes

• [ X] Deployment Changes

  This adds an abi that would need to be deployed to eosio.reserv for a no-op action to notify the account of the NET and CPU weight reserved by the account and the associated fee

API Changes

• [ ] API Changes

Documentation Additions

• [ X] Documentation Additions

  There was the addition of a configuration and usage guide docs/04_guides/08_configure-use-powerup-resource-model.md

[tbfleming]

Some references to the word "rent" remain in the powerup system:

• Fee needed to rent the entire resource market weight
• Rental fees below this amount are rejected
• Exponent of 2.0 means that the price to rent a
• assuming no further renting
• It is added as an inline convenience action to power rental
• rental fee amount
• try renting more

[deckb]

I pulled some sections (and updated them) from the previous RC release notes for some additional information.