Implement non-square matrices, and make a few type improvements. Cleaned up a few old issues. Added two tests.

Details
 - added all the new non-square types
 - separated concepts of matrix size and vector size
 - removed VS 6.0 comments/workarounds
 - removed obsolete concept of matrix fields



git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20436 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/matrixError.vert

@@ -0,0 +1,22 @@
+#version 120
+
+attribute vec3 v3;
+
+uniform mat3x2 m32;
+
+const mat2x4 m24 = mat2x4(1.0, 2.0, 
+                          3.0, 4.0,
+                          3.0, 4.0,
+                          3.0, 4.0, 5.0);
+
+void main()
+{
+    mat2x3 m23;
+    vec3 a, b;
+
+    a = v3 * m23;
+    b = m32 * v3;
+    m23.xy;
+
+    gl_Position = vec4(m23 * m32 * v3, m24[2][4]);
+}