Convert IsopackCache to an ES2015 class.
Convert IsopackCache to an ES2015 class.

No behavioral changes.

Hansoft/meteor,Hansoft/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,nuvipannu/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,jdivy/meteor,DAB0mB/meteor,mjmasn/meteor,DAB0mB/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,jdivy/meteor,lorensr/meteor,Hansoft/meteor,Hansoft/meteor,4commerce-technologies-AG/meteor,lorensr/meteor,DAB0mB/meteor,jdivy/meteor,chasertech/meteor,Hansoft/meteor,Hansoft/meteor,chasertech/meteor,chasertech/meteor,nuvipannu/meteor,mjmasn/meteor,jdivy/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,4commerce-technologies-AG/meteor,nuvipannu/meteor,mjmasn/meteor,Hansoft/meteor,nuvipannu/meteor,4commerce-technologies-AG/meteor,DAB0mB/meteor,jdivy/meteor,DAB0mB/meteor,jdivy/meteor,DAB0mB/meteor,nuvipannu/meteor,lorensr/meteor,nuvipannu/meteor,lorensr/meteor,lorensr/meteor,chasertech/meteor,lorensr/meteor,jdivy/meteor,DAB0mB/meteor,chasertech/meteor,mjmasn/meteor,lorensr/meteor,nuvipannu/meteor