RE COutput/InputStream and friends and migrate over

This branch is probably still horribly broken, but it's a good first step to migrating away from having hecl embedded in the runtime

Runtime/CStringExtras.cpp

@@ -0,0 +1,21 @@
+#include "Runtime/CStringExtras.hpp"
+#include "Runtime/CInputStream.hpp"
+
+namespace metaforce {
+std::string CStringExtras::ReadString(CInputStream& in) {
+  u32 strLen = in.ReadLong();
+  std::string ret;
+  u32 readLen = 512;
+  char tmp[512] = {};
+  for (; strLen > 0; strLen -= readLen) {
+    readLen = 512;
+    if (strLen <= 512) {
+      readLen = strLen;
+    }
+    in.ReadBytes(tmp, readLen);
+    ret.append(tmp, readLen);
+  }
+
+  return ret;
+}
+}