change order of menu items
add images for gallery scene
add icons for gallery scene
implement the rendering of progress bar
add gallery scene and skeletion of panel
implement background rendering of image panel
render hp bar by alpha testing
change the rendering mechanism of image panel
implement image asyc loading from disk
implement progress bar animation
add libarchive library
implement reading image from archive
complete navigation of gallery scene
switch between scenes
recompile libarchive to workaround optimization bug
fix bug of ayns loading thread