Rationalizes the entire tracking of the linker object nodes, effecting
GLSL, HLSL, and SPIR-V, to allow tracked objects to be fully edited before
their type snapshot for linker objects.
Should only effect things when the rest of the AST contained no reference to
the symbol, because normal AST nodes were not stale. Also will only effect such
objects when their types were edited.
All the underpinnings are there; this just parses multiple array dimensions
and passes them through to the existing mechanisms.
Also, minor comment fixes, and add a new test for multi-dim arrays.
