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/CMakeLists.txt

@@ -11,6 +11,8 @@ add_library(core STATIC
   key/arithmetic128.h
   key/key.cpp
   key/key.h
+  ncch/cia_builder.cpp
+  ncch/cia_builder.h
   ncch/ncch_container.cpp
   ncch/ncch_container.h
   ncch/seed_db.cpp