* Added enable/disable line functionality
* Update EquationTextBox to change the opacity of functions have are not visible. Update the function label for the EquationTextBox to increment the label to show f1, f2, f3, etc
* rebase key-graph-features and fix issue where removing an equation box and adding a new one repopulates the previous equation
* Added visibility icon for the equation button hover
* updated EquationButton to be a toggle button to better handle the LineHidden state and other PR comment fixes.
* Updated EquationButton style to use a toggle button and to have placeholder icons for the show/hide states
* Updated equation button after pulling the refactor work into the branch. Fixed the Equation Button in KGF UI
* Fixed Pepe's bugs
* Uncomment temporary.pfx in calculator.vcxproj
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