Add a "Settings" page and Rename Manage Global Properties page

We currently have a Manage Global Properties page that lists off all the global property key/value pairs in the system. This is akin to the about:config page. We need to rename this page to "Advanced Settings".

A new page needs to be created that is called just "Settings". It should be broken up into "pages", with only one visible at a time. Core OpenMRS properties should be divided into pages based on their prefix, and each module should get its own "page" as well. (Eventually modules should be able to override this default page with a custom one of their own, but that's a future ticket.)

Users should not be able to add new global properties or new settings on this page.

Settings will eventually need to be typed into Date, Integer, Concept type of input boxes. However, until TRAC-645 is done and more information is stored about each global property, it will have to be just strings to be entered.