Add CIA building

Quite a lot of code, yeah.

The built CIA is almost identical to GM9, with the following differences:
1. Paddings are zeroed out
2. Title key is not written (GM9 gets it from support data/ticket db)
3. Ticket content index is slightly different (GM9 likely takes it from the legit ticket, while we are building a fake one)

The 2, 3 points can be fixed probably.

src/core/quick_decryptor.h

@@ -23,10 +23,6 @@ using ProgressCallback = std::function<void(std::size_t, std::size_t)>;
  */
 class QuickDecryptor {
 public:
-    /**
-     * Initializes the decryptor.
-     * @param root_folder Path to the "Nintendo 3DS/<ID0>/<ID1>" folder.
-     */
     explicit QuickDecryptor();
     ~QuickDecryptor();