Changed, Visual mode, Auto-align textures actions, UDMF: aligned texture...

Changed, Visual mode, Auto-align textures actions, UDMF: aligned texture coordinates are no longer rounded to integer values.
Changed, Things, Sectors, Linedefs, Vertices modes: we shouldn't select highlighted map element during the copy action when no map elements are selected.
Internal: removed some debug stuff from CheckTextureAlignment and ResultTexturesMisaligned.