cleanup application defaults

[westram]

Several properties are defined via default property files located in ​arb_default.

The drawback of doing that is, that the defaults hardcoded in arb

• have no effect for new (or when resetting saved properties)
• have an effect, if Factory defaults is used from config managers.

Wanted changes:

Examine default property files,

• remove useless/irrelevant settings and
• move remaining relevant settings:
  • either hardcode them or
  • create predefined configs (for config managers).

Also, there are several modified arb_default files on our servers. Examine these files and reduce amount of properties modified there to a minimum.