Refactor LLDAELoader

- Many instances of null-checking if statements include both variable declaration and initialization (for scoping)
- Modern(ish) C++ conventions (e.g. range-based for loops, auto keyword)
- Local variable caching for array/iterator elements
- const keyword for variables that should not be mutated (optimization possible)
- const keyword for instance methods that should not mutate (affects LLModelLoader in one case)
- Consistent usage of un/signed types for array indexing
- Better readability/simplicity of branching
- Consolidated extractTranslation/ViaElement logic (reusability)
- Formatting
- Changes based on code review

indra/llprimitive/llmodelloader.h

@@ -180,7 +180,7 @@ public:
 	//-----------------------------------------------------------------------------
 	// isNodeAJoint()
 	//-----------------------------------------------------------------------------
-	bool isNodeAJoint(const char* name)
+	bool isNodeAJoint(const char* name) const
 	{
 		return name != NULL && mJointMap.find(name) != mJointMap.end();
 	}