Nicer formatting of generated types

[mcmcgrath13]

prior:

module JSONTypes
import StructTypes
mutable struct Item
    id::String
    label::Union{Nothing, String}
    Item() = begin
            #= none:1 =#
            new()
        end
end
mutable struct Menu
    header::String
    items::Array{Union{Nothing, Union{Missing, Item}}, 1}
    Menu() = begin
            #= none:1 =#
            new()
        end
end
mutable struct Root
    menu::Menu
    Root() = begin
            #= none:1 =#
            new()
        end
end
StructTypes.StructType(::Type{Item}) = begin
        #= none:1 =#
        StructTypes.Mutable()
    end
StructTypes.StructType(::Type{Menu}) = begin
        #= none:1 =#
        StructTypes.Mutable()
    end
StructTypes.StructType(::Type{Root}) = begin
        #= none:1 =#
        StructTypes.Mutable()
    end
end

with these changes:

module JSONTypes

import StructTypes

mutable struct Item
    id::String
    label::Union{Nothing, String}
    Item() = new()
end

mutable struct Menu
    header::String
    items::Array{Union{Nothing, Missing, Item}, 1}
    Menu() = new()
end

mutable struct Root
    menu::Menu
    Root() = new()
end

StructTypes.StructType(::Type{Item}) = StructTypes.Mutable()
StructTypes.StructType(::Type{Menu}) = StructTypes.Mutable()
StructTypes.StructType(::Type{Root}) = StructTypes.Mutable()

end # module

[codecov[bot]]

Codecov Report

Merging #165 (29a7723) into main (1c69202) will increase coverage by 0.00%. The diff coverage is 89.65%.

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   88.76%   88.77%           
=======================================
  Files           9        9           
  Lines        1531     1559   +28     
=======================================
+ Hits         1359     1384   +25     
- Misses        172      175    +3     

Impacted Files	Coverage Δ
src/gentypes.jl	96.52% <89.65%> (-1.75%)	:arrow_down:

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