compression.zlib: add basic documentation
compression.zlib: fix help-lint warning, add a bit to the article.
tools.deploy.windows.ico: Throw an error if the .ico is a unsupported
format.
tools.which: adding some docs and cleanup.
tools.which: cleanup code a little.
X11 XK_ISO_Left_Tab is shift tab
X11, give same input as gtk when pressing shift, tab, alt..