* release/2.8.0:
v2.8.0 release
* hotfix/2.8.1:
Fix wrong config include
Add HTML hooks for head and body (before and after) content
Adjust sone models
Adjust HTML hooks
Minor changes
Minor changes

* feature/SML:
Add select for inserting templated channels into hierarchy
Adjust route parameter handling in route definitions
Adjust add channel layout for channel type or template
Make compatible with embedded=2 parameter
Add new model AccumulatorFull
Adjust AccumulatorFull to work correct with meter channels
Fix sum of AccumulatorFull model
v2.9.0 release
v2.9.0 Maintenance release/2.9.0

* release/2.9.0: