refactor: remove old calculate_* and generate_* function stubs

Author: AayushSabharwal

src/systems/abstractsystem.jl

@@ -8,132 +8,6 @@ end
 
 GUIMetadata(type) = GUIMetadata(type, nothing)
 
-"""
-```julia
-calculate_tgrad(sys::AbstractTimeDependentSystem)
-```
-
-Calculate the time gradient of a system.
-
-Returns a vector of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_tgrad end
-
-"""
-```julia
-calculate_gradient(sys::AbstractSystem)
-```
-
-Calculate the gradient of a scalar system.
-
-Returns a vector of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_gradient end
-
-"""
-```julia
-calculate_jacobian(sys::AbstractSystem)
-```
-
-Calculate the Jacobian matrix of a system.
-
-Returns a matrix of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_jacobian end
-
-"""
-```julia
-calculate_control_jacobian(sys::AbstractSystem)
-```
-
-Calculate the Jacobian matrix of a system with respect to the system's controls.
-
-Returns a matrix of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_control_jacobian end
-
-"""
-```julia
-calculate_factorized_W(sys::AbstractSystem)
-```
-
-Calculate the factorized W-matrix of a system.
-
-Returns a matrix of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_factorized_W end
-
-"""
-```julia
-calculate_hessian(sys::AbstractSystem)
-```
-
-Calculate the hessian matrix of a scalar system.
-
-Returns a matrix of [`Num`](@ref) instances. The result from the first
-call will be cached in the system object.
-"""
-function calculate_hessian end
-
-"""
-```julia
-generate_tgrad(sys::AbstractTimeDependentSystem, dvs = unknowns(sys), ps = parameters(sys),
-               expression = Val{true}; kwargs...)
-```
-
-Generates a function for the time gradient of a system. Extra arguments control
-the arguments to the internal [`build_function`](@ref) call.
-"""
-function generate_tgrad end
-
-"""
-```julia
-generate_gradient(sys::AbstractSystem, dvs = unknowns(sys), ps = parameters(sys),
-                  expression = Val{true}; kwargs...)
-```
-
-Generates a function for the gradient of a system. Extra arguments control
-the arguments to the internal [`build_function`](@ref) call.
-"""
-function generate_gradient end
-
-"""
-```julia
-generate_jacobian(sys::AbstractSystem, dvs = unknowns(sys), ps = parameters(sys),
-                  expression = Val{true}; sparse = false, kwargs...)
-```
-
-Generates a function for the Jacobian matrix of a system. Extra arguments control
-the arguments to the internal [`build_function`](@ref) call.
-"""
-function generate_jacobian end
-
-"""
-```julia
-generate_hessian(sys::AbstractSystem, dvs = unknowns(sys), ps = parameters(sys),
-                 expression = Val{true}; sparse = false, kwargs...)
-```
-
-Generates a function for the hessian matrix of a system. Extra arguments control
-the arguments to the internal [`build_function`](@ref) call.
-"""
-function generate_hessian end
-
-"""
-```julia
-generate_function(sys::AbstractSystem, dvs = unknowns(sys), ps = parameters(sys),
-                  expression = Val{true}; kwargs...)
-```
-
-Generate a function to evaluate the system's equations.
-"""
-function generate_rhs end
-
 """
 ```julia
 generate_custom_function(sys::AbstractSystem, exprs, dvs = unknowns(sys),