Add time to touch event

Add a time parameter to touch events, keep track of when touch events
occur.
Metrics to get screen physical resolution

Metrics to get information regarding the physical resolution of a
display.
Works well on Android but desktop implementations seems to always return
same value.
Method to fetch viewport

A method is added to fetch the current viewport.
Delete VBO buffers, release buffers method.

Method to delete VBO buffers, method to release GLBuffers.
Updates to touch methods to include time parameter.
Set GLObject type

Sets the type of GLObject
Keep track of all created objects

Keep a list of created objects so that they can all be released and
destroyed.
Class to hold Velocity, Vector updates.

A class to hold direction + speed. Length, clear and mul method added to
Vector class.
Updates

Some minor updates.