Update Windows installer script in viewer-tools-update (VS 2013)

This Jira is for updates to the windows installer for the work on migrating to VS2013.

So far my changes:
Reduced file by 224 lines of code thus far (about 25%), including added code for new functionality

Code changed that's mostly invisible to the user:
-Don't launch with elevated privileges
-Lots of code cleanup and reorganizing.
-More consistent marking/format of comments, reworded some for clarity
-Combined all calls to delete files on install into one, changed deletion of skins files into one to delete the entire skins folder
-New dialog for prompting if the user want to clear cache also has code to bypass this if auto install is being used, negating the need for 100+ lines of code just to back-up, restore, and remove backup copy of user's settings when old viewer is uninstalled.
-Removed old code that is of no use now, like removing settings files on pre-NT systems (yes, as in windows 95/98) and removing of Mozilla files first (which V3 has never used), and settings in language files that are not used anywhere in the installer script.
-Updated paths to Windows Vista and later format (related to \application data\ -> \appdata\roaming\ and the like)
-Added Nicky Dasmijn's fix for BUG-2707 by disabling SEHOP for installed viewer

Functionality changed:
-Windows Vista SP2/Server 2008 SP2 is now the minimum requirement
-Added Details button on install and uninstall so user can see verbose process. (If the user opts not to show, process takes a lot less time)
Installer no longer auto launches after a user install (still does after a "suppress dialogs" install, like for the auto updater). This is to restore expected behavior of an option to run the viewer or not after installation.
-Add more info to registry for display on Program and Features (like Linden Research as the publisher) (Idea from Firestorm, but not using that info obviously)

Functionality added:
-Added option to remove user's settings and cache folders (but leaves debug logs and chat logs) when the user runs the uninstaller.
Note: this is bypassed if auto update is used (*Testing needed)

To Do:
-Check spelling of comments
-Language translation for new Clear User Setting prompt
Ask user if they want to create a shortcut folder in the start menu (Idea from Firestorm, implemented by Anserial)

Wish list:
-Update to newer NSIS "ModernUI2" layout so options can be presented in a more user friendly format.

Thoughts, comments, and requests desired below.