feat(radar): major cleanup refactor

This commit is a major refactor of the radar module code.

The scanner and radar were each turned into a class (table) to make the
main draw function more generic.
TODO: there's probably a good way to refactor this further to have
both instruments derive from a base class in order to ensure the same
base functionality.

Additionally:

* The 'onChangeMFD' event was removed

* The scanner (3D) and radar (2D azimuth) now each have their own zoom
  level. This prevents the radar from ending up with an auto-zoom zoom
  level when switching from the scanner since it only ever has manual
  zoom.

* The autopilot controls were also moved to the right a little bit to make
  more room for the zoom-level display.

* The scanner was made marginally taller.

data/pigui/modules/autopilot-window.lua

@@ -252,7 +252,8 @@ local function displayAutoPilotWindow()
 	local current_view = Game.CurrentView()
 	local window_h = mainButtonSize.y + smallButtonSize.y + ui.getWindowPadding().y * 2
 	local shift = smallButtonSize.y
-	local window_posx = ui.screenWidth/2 + ui.reticuleCircleRadius / 4 * 3
+	-- X starting position is the edge of the scanner display.
+	local window_posx = ui.screenWidth/2 + ui.reticuleCircleRadius
 	local window_posy = ui.screenHeight - window_h
 	ui.setNextWindowPos(Vector2(window_posx, window_posy) , "Always")
 	ui.window("AutoPilot", {"NoTitleBar", "NoResize", "NoFocusOnAppearing", "NoBringToFrontOnFocus", "NoSavedSettings", "AlwaysAutoResize"},