Engine: engine-sysgroup - fixes #3329

System group creation and editing works except for
+ Content -> Packages
+ Content -> Errata
Engine: Update paths for some common assets (e.g. alchemy, fonts...)
Engine: Activation Keys: changes to support CRUD actions
Engine: remove the absolute namespacing for HttpResource
Engine: add namespacing to KTEnvironment reference
Merge pull request #3213 from bbuckingham/engine

Engine: Activation Keys: several changes to support the Activation Keys UI
Merge pull request #3210 from thomasmckay/engine-sysgroup

Engine: engine-sysgroup - system groups
Engine: Fixes #3319: Fixing Products page, this includes Product and Repository CRUD.