Add textured string for mobile (Android)

contrib/mobile/Android/src/org/geuz/onelab/GLESRender.java

contrib/mobile/Android/src/org/geuz/onelab/Gmsh.java

contrib/mobile/Android/src/org/geuz/onelab/MainActivity.java

...b/mobile/Android/src/org/geuz/onelab/ParameterString.java

...rib/mobile/Android/src/org/geuz/onelab/StringTexture.java

...ib/mobile/Android/src/org/geuz/onelab/mGLSurfaceView.java

contrib/mobile/androidGModel.cpp

contrib/mobile/androidGModel.h

contrib/mobile/drawContext.cpp

contrib/mobile/drawContext.h

contrib/mobile/drawString.cpp

contrib/mobile/drawString.h