Normally you'll want to do these three (and preferably in this order):
1. webcore-piston.groovy import URL:
https://raw.githubusercontent.com/imnotbob/webCoRE/hubitat-patches/smartapps/ady624/webcore-piston.src/webcore-piston.groovy
2. webcore.groovy import URL:
https://raw.githubusercontent.com/imnotbob/webCoRE/hubitat-patches/smartapps/ady624/webcore.src/webcore.groovy
3. webcore-storage.groovy import URL (for $weather functionality):
https://raw.githubusercontent.com/imnotbob/webCoRE/hubitat-patches/smartapps/ady624/webcore-storage.src/webcore-storage.groovy