Introduce Finance Calculator

[Chips1234]

As of July 08th, 2020: The tips calculator is not done yet!! If anyone can help me with the BooltoVisibility converter, that would be great! (P.s. this is still a draft pr)

Fixes #806 .

Description of the changes:

• A new calculation mode, "Financial"
• Includes Compound Interest Calculator
• A tip calculation mode (Not started as of 08th July)

How changes were validated:

• Manual

Note: In code, Financial mode is always mentioned as "FinanceCalculator" for shortness and consistency.
Also, if you have an idea or can tell me how to use the BooleanToVisibility converter that would be nice. Thanks.

[Chips1234]

Can someone take a look?

[mcooley]

Thanks for jumping into the code here--but I think there are many undecided details about how the feature should work which need to be resolved before looking at the code. For example, I'm not sure that we should group both the compound interest and tips calculators under one "Finance" mode.

Let's follow this project's new feature process and work on a spec document which describes how the feature will work. The spec document can be changed faster than the code can and it's easier to share more widely for feedback. Once that document looks good we can move into the "Implementation" phase and reopen this PR.

[Chips1234]

Spec pull made! Look at the spec and go give some feedback!

[Chips1234]

Also, can anyone help me (see gif below, once one grid is loaded, another should collapse but that doesn't happen)?

[joseartrivera]

Also, can anyone help me (see gif below, once one grid is loaded, another should collapse but that doesn't happen)?

I think its a problem with this part of the code, you are setting the DataContext to be the GraphingCalcViewModel instead of your view model.

m_financeCalculator->DataContext = m_model->GraphingCalcViewModel;

[Chips1234]

Alright. Will look into it. Thanks

[Chips1234]

Hmm... Still happens @joseartrivera