Issuance related audit reports (including for REO and IA) (#1258)

Issuance audit reports covering scope of:
- Fix solidity linting issues across all packages #1242 d863720
- Issuance baseline (rebased) #1255 (previously Issuance baseline #1243) 8c08f3a
- Rewards Eligibility Oracle (REO) (rebased) #1256 1bdf837
- Issuance Allocator (IA) (rebased) #1257 f283815

Author: RembrandtK