Set location feature

[dkastl]

Add a function, which allows to set the current location, which may consist of

• (required) Latitude
• (required) Longitude
• (optional) Altitude (if not provided, choose some meaningful defaults)
• (optional) angle horizontal ("heading")
• (optional) angle vertical

[m-schuetz]

Done, see #24

set and get position:

node.localPosition = [x,y,z];
node.globalPosition = [x,y,z];

set orientation (yaw = heading)

node.yaw = 1;
node.yaw += 0.1;
node.pitch = 1;
node.pitch -= 0.1;

set point of view

node.pointOfView = {pos: [1,2,3], pitch: 0.2, yaw: 1.5};