Move MiiData to its own namespace and add ChecksummedMiiData (#6824)

* Move mii to own namespace and add checksummed mii data

* Fix compile issues

* Make mii classes trivial and add cast operator

* Fix Android side

* Add new line at the end of files.

* Make miidata a struct and crc16 a u32_be as per switch code.

* Apply suggestions

* Change back crc to u16 and set padding to 0.

src/citra_qt/applets/mii_selector.cpp

@@ -67,6 +67,5 @@ void QtMiiSelector::OpenDialog() {
              dialog.return_code, index);
 
     const auto mii_data = dialog.miis.at(index);
-    Finalize(dialog.return_code,
-             dialog.return_code == 0 ? std::move(mii_data) : HLE::Applets::MiiData{});
+    Finalize(dialog.return_code, dialog.return_code == 0 ? std::move(mii_data) : Mii::MiiData{});
 }

src/citra_qt/applets/mii_selector.h

@@ -24,7 +24,7 @@ private:
     QVBoxLayout* layout;
     QtMiiSelector* mii_selector;
     u32 return_code = 0;
-    std::vector<HLE::Applets::MiiData> miis;
+    std::vector<Mii::MiiData> miis;
 
     friend class QtMiiSelector;
 };