Add prototype jcall macro

[mkitti]

Prototype @jcall macro:

julia> using JavaCall; JavaCall.init()

julia> System = @jimport java.lang.System
JavaObject{Symbol("java.lang.System")}

julia> @jcall System.out.println("Hello from Java!!"::JString)::Nothing
┌ Info: args: 
│   func = :((:println, System.out))
│   rettype = :Nothing
│   types =
│    1-element Vector{Any}:
│     :JString
│   args =
│    1-element Vector{Any}:
│     "Hello from Java!!"
│   nreq = 0
│   func.head = :tuple
│   func.args =
│    2-element Vector{Any}:
│     :(:println)
└     :(System.out)
Hello from Java!!

julia> Math = @jimport java.lang.Math
JavaObject{Symbol("java.lang.Math")}

julia> @jcall Math.cos(0.0::jdouble)::jdouble
┌ Info: args: 
│   func = :((:cos, Math))
│   rettype = :jdouble
│   types =
│    1-element Vector{Any}:
│     :jdouble
│   args =
│    1-element Vector{Any}:
│     0.0
│   nreq = 0
│   func.head = :tuple
│   func.args =
│    2-element Vector{Any}:
│     :(:cos)
└     :Math
1.0

julia> @jcall Math.acos((-0.0)::jdouble)::jdouble
┌ Info: args: 
│   func = :((:acos, Math))
│   rettype = :jdouble
│   types =
│    1-element Vector{Any}:
│     :jdouble
│   args =
│    1-element Vector{Any}:
│     -0.0
│   nreq = 0
│   func.head = :tuple
│   func.args =
│    2-element Vector{Any}:
│     :(:acos)
└     :Math
1.5707963267948966