feat(app-preferences): add appPreferences plugin

[thomashilzendegen]

No description provided.

[ihadeed]

There should be only one of each functions.

fetch can be:

static fetch(dictOrKey: string, key?: string)

and store:

store(dictOrKey: string, keyOrValue: string, value?: string)

The documentation at the top should explain the different kind of usages.

[thomashilzendegen]

@ihadeed: I see, but why shouldn't overloads be used? The IntelliSense looks quite nice with them.

[ihadeed]

I agree the IntelliSense will look better, but overloading causes issues with the Ionic Native docs generator. Here is what the output of the docs looks like for that page:

store(dict, key, value, key, value)

Stores the provided value for the given key into the named dictionary.

Param	Type	Details
dict	string
key	string
value	*	Stores the provided value for the given key.
key	string
value	*

fetch(dict, key, key)

Retrieves the value for the given key from the named dictionary.

Param	Type	Details
dict	string
key	string	Retrieves the value for the given key.
key	string