* Added following methods in GL class.
* GL#glTexEnvf(int target, int pname, float param)
* GL#glTexEnvi(int target, int pname, int param)
* GL#glTexEnvfv(int target, int pname, float[] params)
* GL#glTexEnviv(int target, int pname, int[] params)
* GL#glGetTexEnvfv(int target, int pname, float[] params)
* GL#glGetTexEnviv(int target, int pname, int[] params)
* GL#glTexParameterf(int target, int pname, float param)
* GL#glTexParameteri(int target, int pname, int param)
* GL#glTexParameterfv(int target, int pname, float[] params)
* GL#glTexParameteriv(int target, int pname, int[] params)
* GL#glGetTexParameterfv(int target, int pname, float[] params)
* GL#glGetTexParameteriv(int target, int pname, int[] params)
* GL#glGetTexLevelParameterfv(int target, int level, int pname, float[] params)
* GL#glGetTexLevelParameteriv(int target, int level, int pname, int[] params)
* GL#glTexImage1D(int target, int level, int internalFormat, int width, int border, int format, int type, float[] pixels)
* GL#glTexImage1D(int target, int level, int internalFormat, int width, int border, int format, int type, byte[] pixels)
* GL#glTexImage1D(int target, int level, int internalFormat, int width, int border, int format, int type, short[] pixels)
* GL#glTexImage1D(int target, int level, int internalFormat, int width, int border, int format, int type, int[] pixels)
* GL#glTexImage2D(int target, int level, int internalFormat, int width, int height, int border, int format, int type, float[] pixels)
* GL#glTexImage2D(int target, int level, int internalFormat, int width, int height, int border, int format, int type, byte[] pixels)
* GL#glTexImage2D(int target, int level, int internalFormat, int width, int height, int border, int format, int type, short[] pixels)
* GL#glTexImage2D(int target, int level, int internalFormat, int width, int height, int border, int format, int type, int[] pixels)
* GL#glGetTexImage(int target, int level, int format, int type, float[] pixels)
* GL#glGetTexImage(int target, int level, int format, int type, byte[] pixels)
* GL#glGetTexImage(int target, int level, int format, int type, short[] pixels)
* GL#glGetTexImage(int target, int level, int format, int type, int[] pixels)
* GL#glGenTextures(int num) : int[]
* GL#glGenTextures(int[] texstureNameArray)
* GL#glGenTextures(int n, int[] texstureNameArray)
* GL#glDeleteTextures(int[] texstureNameArray)
* GL#glDeleteTextures(int n, int[] texstureNameArray)
* GL#glBindTexture(int target, int texture)