Add manual update method also to triggered template sensors

[verjager]

Indeed, this is what I ended up with. Nevertheless it would be a nice-to-have, which improves consistency with other sensors.

My original use-case was this:

Conditions in Trigger-based Template Sensors

I support this request. My use-case is to split a sensor into multiple sensors by means of a number of derived template sensors. This limits the number of external calls. # Template triggered P2000 sensors - trigger: - platform: template value_template: "{{ 'Ambulancediensten' in state_attr('sensor.p2000_zhz', 'discipline') }}" sensor: - unique_id: "p2000_ambulance" name: "P2000 Ambulance" state: "{{ states('sensor.p2000_zhz') }}" a…