Refactors Blocks module with @mtkmodel (#191)

* refactor: Blocks/math.jl

* refactor: Blocks/continuous.jl

* refactor: Blocks/nonlinear.jl

* refactor: Blocks/sources.jl (limited)

* refactor: Blocks/utils.jl (limited)

* docs: set MTK to 8

* refactor: update the arglist of non-dsl components to match the style of dsl components

- this will allow upgradation of those without breaking again

Author: ven-k

docs/Project.toml

@@ -13,7 +13,7 @@ ControlSystemsBase = "1.1"
 DifferentialEquations = "7.6"
 Documenter = "0.27"
 IfElse = "0.1"
-ModelingToolkit = "8.33"
+ModelingToolkit = "8"
 ModelingToolkitStandardLibrary = "1.8"
 OrdinaryDiffEq = "6.31"
 Plots = "1.36"

src/Blocks/Blocks.jl

@@ -5,6 +5,7 @@ module Blocks
 using ModelingToolkit, Symbolics
 using IfElse: ifelse
 import ..@symcheck
+using ModelingToolkit: getdefault
 
 @parameters t
 D = Differential(t)

src/Blocks/analysis_points.jl

@@ -46,7 +46,7 @@ See also [`get_sensitivity`](@ref), [`get_comp_sensitivity`](@ref), [`get_looptr
 ```julia
 using ModelingToolkitStandardLibrary.Blocks
 @named P = FirstOrder(k = 1, T = 1)
-@named C = Gain(-1)
+@named C = Gain(; k = -1)
 t = ModelingToolkit.get_iv(P)
 eqs = [connect(P.output, C.input)
        connect(C.output, :plant_input, P.input)]