Last valid Cookie should be stored in the Module

[Brovning]

Before requesting a new Authentication, the stored Cookie shall be used as long as it is valid.
--> avoid unnecessary authentications with new Cookie

Open question:
How long is a Unifi Cookie valid?
Is it defined somewhere or can it be read out somewhere?

This store-mechanism makes even more sense, if there is a central configurator instance, where the current valid cookie can be stored and reused by every Unifi-Toolbox module.