cleanup: Replace pointers with out-parameters and fix-up formatting

Cleans all of oat_file.h/.cc, parsed_options.h./cc, runtime.h/.cc

Other files are touched only incidentally to use outof(x) instead of &x.

Change-Id: I0bb15111149d53bb21aac2199ef33bd35333b0ca
diff --git a/compiler/image_writer.cc b/compiler/image_writer.cc
index dda36fa..17d75a3 100644
--- a/compiler/image_writer.cc
+++ b/compiler/image_writer.cc
@@ -141,7 +141,7 @@
     return false;
   }
   std::string error_msg;
-  oat_file_ = OatFile::OpenReadable(oat_file.get(), oat_location, nullptr, &error_msg);
+  oat_file_ = OatFile::OpenReadable(oat_file.get(), oat_location, nullptr, outof(error_msg));
   if (oat_file_ == nullptr) {
     PLOG(ERROR) << "Failed to open writable oat file " << oat_filename << " for " << oat_location
         << ": " << error_msg;