stop specializing on argument types of display

[KristofferC]

There is no real advantage in specializing on the argument types for display since it goes through a quite complicated machinery of trying to find applicable displays anyway. This function is getting compiled for every type we show in the REPL for example.

Before:

julia> let
        @time precompile(Tuple{typeof(Base.Multimedia.display), Int32})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Vector{Int}})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Float64})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Symbol})
       end
  0.034542 seconds (37.08 k allocations: 1.916 MiB)
  0.042272 seconds (92.57 k allocations: 4.810 MiB)
  0.039003 seconds (90.20 k allocations: 4.758 MiB)
  0.030826 seconds (61.08 k allocations: 3.066 MiB)

After:

julia> let
        @time precompile(Tuple{typeof(Base.Multimedia.display), Int32})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Vector{Int}})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Float64})
        @time precompile(Tuple{typeof(Base.Multimedia.display), Symbol})
       end

  0.000041 seconds (12 allocations: 640 bytes)
  0.000029 seconds (10 allocations: 544 bytes)
  0.000024 seconds (9 allocations: 496 bytes)
  0.000021 seconds (9 allocations: 496 bytes)