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(cherry picked from commit 04c036d5)

Minimal Change to Avoid Some Re-reading of Metadata from Raw Images

See merge request !42

Caller was supposed to free the StorageInfo, which with the old binding
we never did

There was some copy-paste going on there that didn't actually match the
C structs

There were some unhandled and thus ignored cases that maked recentish
vala print a warning

References of [GtkChild] fields is handled by GtkBuilder, type must be unowned

See merge request !40

(cherry picked from commit e92fde71)

Move GStreamer file parsing into external process

Closes #128

See merge request !39

And split VideoSupport.vala into classes