TorchToggle: add a longclick listener to launch the torch app main activity

patchset 2:
    added methods to StatefulToggle.java, rebased long click intent handling

patchset 3:
    rebased, make the damn thing work

patchset 4:
    remove unused variables

Change-Id: I56bc6081c2f476e64e7f37056e480c7cc800e024