Modest cleanups for DSi_NAND (#1714)

* Add a definition for TMD files

* Wrap TitleMetadata in a namespace

* Add a comment

* Remove TitleMetadataCertificate

- melonDS ignores it anyway

* Refactor the use of title metadata

- Move bitwise operations on the title ID into helper methods
- Use TitleMetadata objects instead of pointers to raw data

* Slight cleanup in DSi_NAND

- Replace some constants with sizeof
- Use an NDSHeader object instead of a raw array of bytes

* Add a DSi_NAND::ImportFile overload that loads a file from memory

* Split most of ImportTitle into InitTitleFileStructure

- It will be reused in the next commit

* Add ability to import title from memory

* Fix another potential issue

* Fix broken DSiWare installation

- The bytes of the title ID/category were being swapped in most places, but not all

* Add some logging calls

* Declare array sizes in DSi_TMD in decimal, not hex

* Add a space after the #endif

- To adhere to the style guide

* Assert the size of TitleMetadataContent

* Change the type of SignatureName

* Don't mark the TMD structs as packed

* Remove extraneous comments

* Cut down some newlines

src/frontend/qt_sdl/TitleManagerDialog.h

@@ -29,6 +29,8 @@
 #include <QNetworkReply>
 #include <QNetworkAccessManager>
 
+#include "DSi_TMD.h"
+
 namespace Ui
 {
     class TitleManagerDialog;
@@ -90,7 +92,7 @@ private:
     Ui::TitleManagerDialog* ui;
 
     QString importAppPath;
-    u8 importTmdData[0x208];
+    DSi_TMD::TitleMetadata importTmdData;
     bool importReadOnly;
 
     QAction* actImportTitleData[3];
@@ -104,7 +106,7 @@ class TitleImportDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit TitleImportDialog(QWidget* parent, QString& apppath, u8* tmd, bool& readonly);
+    explicit TitleImportDialog(QWidget* parent, QString& apppath, const DSi_TMD::TitleMetadata* tmd, bool& readonly);
     ~TitleImportDialog();
 
 private slots:
@@ -124,7 +126,7 @@ private:
     QNetworkReply* netreply;
 
     QString& appPath;
-    u8* tmdData;
+    const DSi_TMD::TitleMetadata* tmdData;
     bool& readOnly;
 
     u32 titleid[2];