Added icons for signal strength and battery level indication
Renamed _mapCentrePos to _playerPos to better signify what this variable really holds
Made cTab_fnc_draw_userMarkers return TRUE (since it seems recommended)
Add current time, battery and signal strength indicator to MicroDAGR header.
Add current heading, grid position and heading octant to MicroDAGR footer.
Add function cTab_fnc_degreeToOctant to convert degree (out of 360) to octant string.
Add function cTab_fnc_draw_hook to draw hook information to dialog.
Closes #53.