Consolidate SimpliSafe property services

[bachya]

Breaking Change:

1. All services related to changing SimpliSafe system properties (alarm volume, alarm duration, etc.) have been consolidated into a single set_system_properties service.
2. The set_pin and remove_pin services can now only be called by admin users.

Description:

While experimenting with the various SimpliSafe property methods (set_chime_volume, etc.), I came to a realization: because SimpliSafe's cloud API anticipates receiving updated property values all at once, our method (sending properties one at a time) can result in failed updates if those calls happen too close together. This PR consolidates all of the relevant service calls into a single set_system_properties admin service (whose payload can include any/all system-related properties).

Additionally, commentary by @MartinHjelmare made me realize that like this new service, the other services provided by the integration – set_pin and remove_pin – are sensitive enough to require admin rights; this PR updates them to be admin services, as well.

Related issue (if applicable): N/A

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#11667

Example entry for configuration.yaml (if applicable):

simplisafe:
  accounts:
    username: !secret ss_username
    password: !secret ss_password

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.

[bachya]

@MartinHjelmare Anything else you'd like to see?

[MartinHjelmare]

Looks good!