4i) Approval of Third Amendment to Agreement 15-056 with Thomson Reuters/Aumentum in the Amount of $12,000, for a New Total Contract Amount of $2,490,533, Related to the Acquisition of County-Wide Property Tax Software System - a Custom Online Payment Integration to the County's Payment Vendor for Online Tax Bill Payments and a Breakout of the Go-Live Approval into Two Stages to Reflect the Phased Go-Live of the Public Access Functionalities; Authorize the Chief Executive Officer or her/his designee to Execute any and all Documents in Relation to the Transaction; and Authorize the Chief Executive Officer or her/his Designee to Sign Any Future Amendments to the Agreement That Do Not Alter the Fiscal Aspect of the Thomson Reuters/Aumentum Master Agreement for Licensed Software, Hardware, and Services