ModelicaSystem - rewrite set*() functions (#314)

* [ModelicaSystem] add type hints for set*() functions and rename arguments

* fix some type hint issues in setInput()
* prepare for definition via dictionary replacing 'a=b' and '[a=b, c=d]' style

* [ModelicaSystem] add _prepare_inputdata()

* [ModelicaSystem] update _set_method_helper()

* rename from setMethodHelper()
* use _prepare_inputdata()
* cleanup code to align with new input as dict[str, str]

* setInput() is a special case

* [ModelicaSystem] improve definition of _prepare_inputdata()

* [ModelicaSystem] rename _prepare_inputdata() => _prepare_input_data()

* [ModelicaSystem] update setInput()

* replace eval() with ast.literal_eval() as a saver version
* use _prepare_input_data()
* simplify code

* update tests - use new dict based input for set*() methods

* [ModelicaSystem] add type hint for return value of isParameterChangeable()

* [ModelicaSystem] fix type hint for _prepare_input_data() - use dict[str, Any]

* [ModelicaSystem] setInput() - handly input data as list of tuples

This method is used to set input values. It can be called with a sequence of input name and assigning
corresponding values as arguments as show in the example below. Compared to other set*() methods this is a
special case as value could be a list of tuples - these are converted to a string in _prepare_input_data()
and restored here via ast.literal_eval().

* update tests - use new dict based input for setInput() method

* [test_linearization] fix setInput() call

* [ModelicaSystem] simplify _set_method_helper()

* [ModelicaSystem] improve setInputs() - reduce spaces / cleanup

* [ModelicaSystem] fix rebase fallout

* [ModelicaSystem] fix rebase fallout 2

* [ModelicaSystem] remove _has_inputs - is defined by _inputs empty or not

* [test_ModelicaSystem] cleanup

* [ModelicaSystem] simplify handling of inputs

* [ModelicaSystem._set_method_helper] fail if parameter is *NOT* changeable

* if this happens, the result would be unexpected
* fail early, fail hard to indicate this to the user
* simplify code

* [ModelicaSystem] rename overwritedata => overridedata

Author: syntron