Moved the UI binding to a separate file as there is still a circular
dependency with 'engine'. But every other file that depends on Settings
is no longer part of a larger dependency cycle.
Adding a few custom types and documentation to clean up TSLint rule
violations. Included some usage of rule disabling for things like long
lines where we need to extract text that the user would see. That level
of text should really be separated from the logic.
