Add: glMaterialiv function

Update: plGL documentation.
Add: glColor3ub, glColor3ubv
Add: glColor3ui, glColor3us, glColor3uiv, glColor3usv
Add: glColor4b, glColor4bv
Add: glColor4d
Add: glColor4i, glColor4iv
Add: glColor4s
Add: glColor4sv
Add: glColor4ui, glColor4ubv, glColor4uiv
Add: glColor4us, glColor4usv
Add: glLightiv
Add: glNormal3fv
Add: glNormal3d, glNormal3dv
Add: glNormal3b, glNormal3bv
Add: glNormal3i, glNormal3s, glNormal3iv, glNormal3sv
Update: plDoc
Update: CHANGELOG
Add: glPixelStoref
Update: pldoc
Update: CHANGELOG