Allow the user to customise which resources they want to see via Settings

[JeffinSiby]

With the addition of more resources, users should be able to choose which resources they see in their CICS view via Settings (UI).

Proposed UI: Users open Settings (UI) and then can select/unselect checkboxes to choose which resources to display. They should be able to then apply these changes by refreshing the window.

Changes required:

1. Update package.json to add these checkboxes
2. Add resource children to regions container based on which checkboxes are selected (remember to do the same for the 'All' trees!)
3. Filtering on a Regions container currently shows options for all the resources. This should be changed so that the options shown depend on which resource checkboxes are selected.