V2

[nourharidy]

• changed reserve setters to preserve price (reserves ratio) instead of preserving k
• add minDbrRatePerYear, allowing gov to enforce a minimum emission rate
• renamed dola to asset across code base in order to use the auction to buy other assets such as INV, LP tokens, etc
• renamed saleHandler to DolaSaleHandler for clarity when using other assets
• added sendToGov() which allows anyone to send proceeds to gov if no sale handler is attached to the auction

Why:

• To fix the bug in reserve setters which changes auction price instead of depth
• To allow gov to create new DBR auctions for other assets such as INV or LP tokens etc.
• To allow gov to enforce a minimum DBR budget for auctions which cannot be overridden by the operator