Implemented stopwatch, distance indicator, route drawing

Added a stopwatch to measure current time of route and also a distance
travelled indicator.
Increased the size of the start and stop buttons for route recording.
Added logic to draw current travelled route.
Also added logic to hide compass and my location buttons and disable pan
mapping while recording a route.
Map camera moves to current location on initial map load and also when
route points  get updated.
Added initial route drawing code using poly lines.