Properties = function() {
		this.mProperties = {};
		this.aKeys = null;
	}
@class Represents a collection of string properties (key/value pairs).

Each key and its corresponding value in the collection is a string, keys are case-sensitive.

Use {@link module:sap/base/util/Properties.create} to create an instance of {@link module:sap/base/util/Properties}.

The {@link #getProperty} method can be used to retrieve a value from the collection,
{@link #setProperty} to store or change a value for a key and {@link #getKeys}
can be used to retrieve an array of all keys that are currently stored in the collection.

@public
@since 1.58
@alias module:sap/base/util/Properties
@hideconstructor