Tests: More broadly use automapping binding/location.

This adds or changes binding/location decorations in 100s of shaders.
It also allows more output (spv.register.autoassign.rangetest.frag)
due to allowing ioMap() to fail.

Test/baseResults/spv.depthOut.frag.out

@@ -16,6 +16,8 @@ spv.depthOut.frag
                               Name 10  "Depth"
                               Name 14  "Color"
                               Decorate 8(gl_FragDepth) BuiltIn FragDepth
+                              Decorate 10(Depth) Location 1
+                              Decorate 14(Color) Location 0
                2:             TypeVoid
                3:             TypeFunction 2
                6:             TypeFloat 32