Settings menu

[MGlolenstine]

I've added a settings menu window under Options -> Settings.

The settings menu currently contains settings for changing the colors of the elements inside of HexView and ASCIIView, and byte grouping.

Theme settings is a CollapsedHeader, which hides the settings to not clutter the UI if not needed.

Setting changes are seen immediately.

Screenshots:

Closes #10 .

[ethteck]

Just to put it here so it's recorded, this looks awesome! I added a couple more options.. I might add a couple more too. But in the meantime, I think we should have the storing/loading of these settings as part of this PR

[MGlolenstine]

The configuration gets loaded at the startup and saved when the Save Workspace in the File menu is clicked.

If we open the program by passing the arguments (or drag-dropping files onto the executable), the configuration in the current directory will not be loaded, but when the temporary workspace is saved, a modal opens up and warns you that you will overwrite the current configuration.

[ethteck]

I haven't tested it yet, which I will soon. In the meantime, here's some stuff I found in the code

[MGlolenstine]

I have addressed the above change requests.

The overwrite modal now looks like this:

Does the path have to be relative or absolute?

[ethteck]

I think relative is fine for now. looks good!