Started to setup for codebase validation tests.

Fleshed out initial version of AST::is_equal( AST* )

Setup the test directory with initial files for each major validation test.

test/Unreal/Readme.md

@@ -0,0 +1,25 @@
+# Unreal Header & Source reconstruction tests
+
+***Note: This validation test has not been implemented yet.***
+
+Will test the following modules + plugins:
+
+* Kismet
+* Slate
+* RTTI Bases
+* Gameframework
+* Actor & Component Bases
+* Lyra
+
+In the future I could attempt to do a similar test to that of the godot engine full compilation test.
+
+For now it just does the following:
+
+* Download the Unreal source code
+* For each module
+    1. Grab all header and source file paths
+    2. Generate an ast for each file and serialize it to a file called `<name of file>.gen.<h/c>`
+    3. Reconstruct the ast from the generated file
+    4. Compare the original ast to the reconstructed ast
+
+This wil most likely be the most difficult test along-side godot's full compilation test.