Parsing exprs, enum_decls, Introduce intern table, symbol table

memory.h

@@ -0,0 +1,12 @@
+
+typedef struct Arena{
+  OS_Memory memory;
+  U64 len;
+  U64 alignment;
+}Arena;
+
+function B32 string_compare(String a, String b);
+function void *arena_push_size(Arena *a, SizeU size);
+function String arena_push_string_copy(Arena *arena, String string);
+#define arena_push_array(a,T,c) arena_push_size(a,sizeof(T)*(c))
+#define arena_push_struct(a,T) arena_push_array(a,T,1)