WTH No "template safe" way of getting last_updated, last_changed from an entity

[tom_l]

@eyager

Everyone who used this method will have to find a different way to get a datetime string.

Some methods to accomplish this have been discussed here, none of which require a datetime object.

Heads up! Upcoming breaking change in the Template integration

NOTE 2: Guidance for 0.116 and upcoming changes in 0.117 0.116 introduced improvements to mitigate performance problems reported by some users of 0.115 for templates containing states and states.DOMAIN. There are now built-in rate-limits that prevent excessive processing. If your template refers to states, any entity in your entire system that changes state will cause the template to be evaluated (updated). 0.116 ensures evaluations cannot happen more than once a minute. In 0.117 the rate-lim…