Various changes

- Remove the vertex data from Model
- Add InstancedModel
- Add a method to upload a single Uniform to a program
- Improvements to the StringModel
Signed-off-by: Aleksi Sapon <QcTechs@gmail.com>
Return a copy of the vertex attribute buffer for reading

Fixes a bug when trying to read multiple times
Signed-off-by: Aleksi Sapon <QcTechs@gmail.com>
Better method names for VertexAttribute

Signed-off-by: Aleksi Sapon <QcTechs@gmail.com>
InstancedModel javadocs

Signed-off-by: Aleksi Sapon <QcTechs@gmail.com>