Display control field count (and some cosmetic changes)

Cosmetic changes:
* The resonator detail and game status (MU count) tooltips had some indentation issues (at least, they did on my computer. If this is not the case for everyone, let me know and I'll remove it from this PR).
* Changed the stylesheet so the chat input box used all the available space properly.
* Added a `<title>` element to head. 'Ingress Intel Map' is just what was there previously. (Addresses #15)

Major change:
In an attempt to partially address #19 I have all the field objects register themselves in a 'portal2field' hash map using the portal guid at the vertices. The unique array of field guids for each portal is then added to `portalV2.linkedFields`.

Right now, the data is just added to the portal details pane, but you can use the array of field guids how ever you want.