jpegdec reimplementation (#912)

* add jpegdec reimplementation

* reduce work memory

* fix color space

* jpegdec: cleanup results to use atmosphere style

* fix outdated comments, correct do/while bug

Co-authored-by: Michael Scire <SciresM@gmail.com>

libraries/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp

@@ -102,6 +102,9 @@ namespace ams::impl {
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, Main);
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, IpcServer);
 
+    /* jpegdec. */
+    AMS_DEFINE_SYSTEM_THREAD(21, jpegdec, Main);
+
     /* pgl. */
     AMS_DEFINE_SYSTEM_THREAD(21, pgl, Main);
     AMS_DEFINE_SYSTEM_THREAD(21, pgl, ProcessControlTask);