Add the STR RPC to overlord and game code (#134)

* work in progress streaming rpc, simple test is working

* actually add the test

* debug windows failure

* windows fix maybe

* windows 2

* use str-load-status

* update types

goal_src/kernel/gstring.gc

@@ -57,4 +57,17 @@
         )
       )
     )
+  )
+
+(defun charp<-string ((dst (pointer uint8)) (src-string string))
+  "Copy a GOAL string into a character array."
+  (let ((src (-> src-string data)))
+    (while (!= 0 (-> src))
+      (set! (-> dst) (-> src))
+      (&+! dst 1)
+      (&+! src 1)
+      )
+    (set! (-> dst) 0)
+    0
+    )
   )