1. When executed in the emulator the viewer will crash if you press
Right on any zip file in the filechooser. This is because the assertion
on "df /mnt/us | tail -1" will fail as "/mnt/us" is normally
non-existent.
2. The proper (faster, reliable, portable) way of obtaining the number
of total and free bytes on a filesystem is by using the statvfs(2)
system call via util.df Lua interface, see util.c.
3. Removed the "used" field in the function's return as unused and
unneeded.
1. Enhance FileInfo:FileSize() to handle gigabytes and rename it to FileInfo:FormatSize() as it is not just for file sizes.
2. Add "Free space" field to file info because it is useful to see it when deciding whether to remove this file or not.
this allows to render glyphs and also brings a simple
engine for rendering UTF-8 strings onto the framebuffer.
blitting to uneven offset is implemented here, too, but
needs more work and is still buggy.
In the end, this will allow for a simple GUI.
