Higher level ore respawn rates changed

Ore - Default respawn - Proposed respawn
--------------------------------------------------------------
Coal: 60 seconds : 45 seconds
Gold: 120 seconds : 90 seconds
Silver 120 seconds : 60 seconds
Mithril: 240 seconds : 180 seconds
Addy: 480 seconds : 300 seconds
Runite: 25 minutes : 15 minutes