Refactoring the input classes

[R0drigoSchwartz]

This pull request contains the refactoring of the input classes.

Since I started to navegate into these classes I noticed that they had a lot of common methods, because when I need to modify something, I had to apply the modification in a lot of different files, that is a little painful. To minimize this replication, I developed hierarchical classes that can be inherited by the input classes.

The hierarchical structure is organized as follows:

class UserInput(QDialog)

This is the top-level class, from which all other lower classes in the hierarchical structure inherit. It's has some basic methods, like configure the window, paint icons and load tables.

To the other classes, I tried to separate them by their input type (nodes, lines and elements).

To the nodal inputs, I created the NodesInput class:

class NodesInput(UserInput)

This class contains the common methods for inputs that interact with nodes. It also contains some property assignments and methods for removing nodal properties, for example.

Since that we have a lof of inputs that works with nodes, I identified two types of classes that can specialize the NodesInput class:

class StructuralNodesInput(NodesInput)

class AcousticNodesInput(NodesInput)

These classes have some particularities, according to their physical domain (structural or acoustic).

To the lines input, I created the LinesInput and the StructuralLinesInput classes:

class LinesInput(UserInput)

class StructuralLinesInput(LinesInput)

I didn't create an AcousticLinesInput class, since that the classes that works with lines from this physical domain don't have common methods.

To finish, I created the ElementInput class:

class ElementsInput(UserInput) 

This class has just some basic property assignments, because the element classes aren't very common.

Below is a list of which classes inherit from which classes:

• UserInput: NodesInput, LinesInput, ElementsInput, AddAcousticTransferElementInput, SetInertialLoadInput and StressStiffeningInput.

• NodesInput: AcousticNodesInput, StructuralNodesInput.

• AcousticNodesInput: AcousticPressureInput, RadiationImpedanceInput, ReciprocatingCompressorInputs, ReciprocatingPumpInputs, SpecificImpedanceInput and VolumeVelocityInput.

• StructuralNodesInput: ElasticNodalLinksInput, MassSpringDamperInput, NodalLoadsInput and PrescribedDofInput.

• LinesInput: AcousticElementTypeInput and StructuralLinesInput.

• StructuralLinesInput: BeamXaxisRotationInput, ExpansionJointInput and ValvesInput.

• ElementsInput: PerforatedPlateInput, TurnOffAcousticElementsInput and DecouplingRotationDofsInput.

This approach can be useful for reducing code duplication and centralizing certain methods. Now, if we have to fix something in these classes, maybe we don't need to apply the fix in a lot of different places.

This is not the final version. I believe that, over time, we can improve this approach by implementing more methods in these classes and refactoring the old methods to reuse them.

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Note: This branch was created from the data_manager branch. This week I will create the PR of this branch, that will be merged first into dev branch. So disregard the modifications that that are not specifically related to user input classes. I know it's not a good practice, but I wanted to create this pull request early to discuss with you.
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[vitorslongo]

The previous issues were not completely related to the specific work you've made here Rodrigo, but they were corrected by Jacson in his last commits, so you can ignore my previous comments. Keep up the good work!

[vitorslongo]

Good Job, everything seems to be working nicely.