feat: make IO.write call toString on argument and add corelib with List.toString

make_corelib

@@ -0,0 +1,31 @@
+#!/usr/bin/python
+import re
+
+with open("corelib.wren", "r") as f:
+  lines = f.readlines()
+
+# Remove the comment from the top.
+lines.pop(0)
+lines.pop(0)
+
+corelib = ""
+for line in lines:
+  line = line.replace('"', "\\\"")
+  line = line.replace("\n", "\\n\"")
+  if corelib: corelib += "\n"
+  corelib += '"' + line
+
+with open("src/wren_core.c", "r") as f:
+  wren_core = f.read()
+
+# re.sub() will unescape escape sequences, but we want them to stay as escapes
+# in the C string literal.
+corelib = corelib.replace('\\', '\\\\')
+
+corelib = "coreLibSource =\n" + corelib + ";"
+
+PATTERN = re.compile(r'coreLibSource =\n("(.|[\n])*?);')
+wren_core = PATTERN.sub(corelib, wren_core)
+
+with open("src/wren_core.c", "w") as f:
+  f.write(wren_core)