salplug:literaltoboolconversion

Change-Id: I94b3bea97b6b4710bd4bf4c0fe88a1518a151de5
loplugin:stringconcat

Change-Id: Ibf410eb1b8be81505b8e778aadf916a26ba39468
Clean up surrogates.hxx

Change-Id: I0eae089be1bde9db822a77bea482c10650c8a137