Updated claimHelper address management, added deployment script for i…#7

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dhadrien wants to merge 3 commits intofeat/claim-all-rewards-helperfrom feat/claimerhelper-admin-role

+134-40

Commits on Mar 19, 2021

Updated claimHelper address management, added deployment script for implem
dhadrien
committed

Commits on Mar 23, 2021

Added ClaimHelperChanged event
dhadrien
committed

Commits on Mar 24, 2021

natspeced claimHelper setter and getter
dhadrien
committed