[mythtv] [PATCH] Mythbrowser GUIOffset fix and misc additions

[Tim Harvey]

I noticed back in the mail list that someone had mentioned MythBrowser
doesn't honor the GuiOffsetX/Y settings so I decided to patch it up.
While I was playing with it, I added a few things.  

This patch effects the following changes to the MythBrowser plugin:

   - places browser window according to GuiOffsetX/Y
   - implements mouse-scrolling options:
        When holding either the middle mouse button or the ALT key and 
        dragging the mouse, the page will scroll in a direction based on

        the 'Scroll Page' option, at a speed related to the 'Scroll
Speed' 
        setting. 
   - implements ability to hide the scrollbars based on a setting
checkbox
   - implements options in settings dlg for 'Scroll Page' and 'Scroll
Speed' 
     and 'Hide Scrollbars'
   - implements mouse-wheel zooming:
        When holding either the middle mouse button or the ALT key and 
        scrolling the mouse-wheel, the zoom factor will adjusted 
        according to the direction of the wheel movement


I'm much grateful for Philippe Cattin's contribution of MythBrowser,
I've found it to be a pretty cool addition.  

I hope others find this patch of use.

Tim