Modernize MakeROM build system + bug fixes (#120)

* Move files around to new directory structure

* Rework libyaml into a stand-alone dep for makerom.

* Rework libpolarssl to be standalone dependency for makerom.

* Update includes.

* Delete makefile

* Add new makefile for makerom.

* Update MakeROM github actions script.

* Fix again.

* Update MakeROM's makefile

* Tweak makerom build script

* Tweak MakeROM build script.

* Fix typo

* Update MakeROM makefiles.

* Tweak CTRTool build script.

* Tweak build script

* Tweak CTRTool build script.

* Tweak CTRTool build script

* Add libmbedtls to makerom deps

* Partially migrate makerom to libmbedtls

* Break out libblz as an external dependency for makerom.

* Tweak makerom build script.

* Move dependencies to the top level.

* Put everything back.

* misc

* Update makerom documentation.

* Link to ctrtool/makerom readmes from the root readme.

* Update root readme again.

* Migrate makerom to modern mbedtls

* Bump makerom version to 0.18.1

* Change signing errors to be warnings when they fail.

* Add error verbosity to errors when generating CIA files.

* Fix bug in RSA code.

* misc.

* Remove polarssl now migration to mbedtls complete.

* Surface more makerom errors.

* [makerom] Tolerate CCI signing errors as a warning.

* Add missing return.

* Import initial data key_x (prod/dev included)

* [makerom] Fix initial data generation.

makerom/src/exheader_build.h

@@ -0,0 +1,23 @@
+#pragma once
+#include "exheader.h"
+
+typedef enum
+{
+	COMMON_HEADER_KEY_NOT_FOUND = -10,
+	EXHDR_BAD_RSF_OPT = -11,
+	CANNOT_SIGN_ACCESSDESC = -12
+} exheader_errors;
+
+typedef struct
+{
+	keys_struct *keys;
+	rsf_settings *rsf;
+	bool useAccessDescPreset;
+
+	/* Output, these ptrs where created originally in ncchset */
+	extended_hdr *exHdr;
+	access_descriptor *acexDesc;
+} exheader_settings;
+
+/* ExHeader Build Functions */
+int BuildExHeader(ncch_settings *ncchset);