Steven Valeri

Comments addressed - ready for re-review

Additional updates added - ready for re-review + switch to using bit 63 in reserve configuration + add reserve configuration unit tests + minor test case updates

> > All existing assets will continue to have flashloans enabled. In the future this will allow for explicit errors when attempting to flashloan gho. > > Hey @stevenvaleri !...

I think it makes more sense to enable separately after the reserve is added - this would be consistent with making something borrowable, or enabled as collateral. If you want...