adds a button to the ui which enables the user to create the mesh from the image

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
implements: PImage getSelectedImageRoi()
which returns a separate PImage object containing the roi of the image

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds a camera & the meshCreator instance

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds - getWidth() & getHeight() methods

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
implements MeshCreator class
- its containing the mesh in a PShape and WETriangleMesh representation

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>