Plugin: DashBoard

[SethDart]

Hi all,

Here's the first version of the DashBoard plugin, made from the demo plugin from Dave.

Display Lat, Lon, COG, SOG from NMEA stream in a wxMiniFrame.
Fonts can be changed by user in global settings.

I created a basic DashboardInstrument class, that'll be expanded to handle:
- analog data display (done)
- compass
- "speedometer" view
- "wind" view
and maybe
- depth
- GPS status
- route overview
- chart overview

For now there's no way to change colors, I choose Blue ; might change. Maybe there'll be a way to manage colors in OpenCPN some day?

I also plan to create an option form to select instruments to display, reorder them, select NMEA fields...
The current right-button menu might change to a top panel button when it's more mature.

I choose to use a wxMiniFrame instead of the wxWindow used by Dave. It might change.

There'll be more patches as I complete any of the features I'm currently working on

More to come ASAP, comments welcome!

PS: I'll post these patches to the tracker soon.