WIP : Various changes to project before small hiatus. (Broken)

I need to manually review these as the changes have various errors that are difficult to diagnose why.

I took a break to do handmade hero and now a bit rusty.

docs/AST_Design.md

@@ -0,0 +1,37 @@
+# Forward
+
+Was never satisfied with how I did the wrap of the management of the AST.  
+For C++, the current design may be as good as it gets for the limitations of the langauge.
+
+I'll at least try in this issue to brainstorm something simpiler without losing ergonomics.  
+This will also be a good place to document the current design.
+
+## Current Design
+
+`AST` is the actual managed node object for the library.  
+Its raw and really not meant to be used directly.
+
+All user interaction must be with its pointer so the type they deal with is `AST*`.  
+For user-facing code, they should never be giveen a nullptr. Instead, they should be given a designated `Invalid` AST node.
+
+In order to abstract away constant use of `AST*`, I wanted to provide a wrapper for it.
+
+The simpliest being just a type alias.
+
+```cpp
+using Code = AST*;
+```
+
+This is what the genc library would have to use due to its constraints of a langauge.
+Anything else and it would either be an unergonomic mess of struct wrapping with a mess of macros & procedures to interface with it.
+
+Further, to provide intuitive filters on the AST, there are AST types (covered in [AST_Types.md](AST_Types.md)).
+
+These are pure PODS that just have the lay members relevant to the type of AST node they represent.  
+Each of them has a Code type alias specific to it.
+
+Again, the simpliest case for these would be a type alias.
+
+```cpp
+using struct AST_Typedef CodeTypedef;
+```