Application
Creates a new #GApplication instance.
If non-null, the application id must be valid. See g_application_id_is_valid().
If no application ID is given then some features of #GApplication (most notably application uniqueness) will be disabled.
Return
a new #GApplication instance
Parameters
applicationId
the application id
flags
the application flags
constructor(pointer: <Error class: unknown class><<Error class: unknown class>>)