loaders: TIFF: Mark internal funcitons static.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
demos: spiv: Two fixes.

* Add destroy functions for image list, image loader
  and call them on exit.
  (this makes memory debugging with valgrind easier)

* Map 0 key to resize by 10 action.
  (1-9 was mapped to resize by 1-9 beforehand)

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
loaders: Containers, ZIP: More work done.

* Add ZIP signature matching function

* Add basic seek API + Code
  (not finished, yet but mostly working)

* ZIP: fix loading for uncompressed parts

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
build: Update list of exported symbols.

Add TIFFSave() + Container + ZIP container API.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
spiv: A bit crude support for containers.

* Mostly works, needs better implementation though

Signed-off-by: Cyril Hrubis <metan@ucw.cz>