[gl.xml] non-parsable groups "DataType" and "FfdMaskSGIX"

[SunSerega]

1. Line 1017:

   		<group name="DataType" comment="See enums block below"/>
   

   There isn't anything in enums tag, refering to this, but on line 240:

   		<group name="DataTypeEXT">
   			<enum name="GL_SCALAR_EXT"/>
   			<enum name="GL_VECTOR_EXT"/>
   			<enum name="GL_MATRIX_EXT"/>
   		</group>
   

2. Line 1264:

   		<group name="FfdMaskSGIX" comment="See enums section below. Was SGIXFfdMask"/>
   

   This time there are enums refering to this, on line 5137:

   	<enums namespace="GL" group="FfdMaskSGIX" type="bitmask">
   		<enum value="0x00000001" name="GL_TEXTURE_DEFORMATION_BIT_SGIX"/>
   		<enum value="0x00000002" name="GL_GEOMETRY_DEFORMATION_BIT_SGIX"/>
   	</enums>
   

Still, in both cases comments are used, which aren't parsable.

I guess DataType group should be removed, as it isn't used anywhere (instead all commands use DataTypeEXT).
And FfdMaskSGIX should be properly filled.

[Perksey]

The group blocks are deprecated in favour of group attributes as described in #335 and #343. Please check if your issue is still present with the new schema. If the PR fixes your issue, please close it.

[SunSerega]

I've seen issue, but not pull before posting...
I'll close this when/if pull get's merged.