Changelog:
-This updates adds support for the new nxtheme format, a legal and cross-firmware format for themes that can be freely shared.
-Also there's the new NxThemes Installer, an homebrew that can manage custom themes directly on the switch, it can install both nxtheme and szs themes.
To avoid issues with nca extraction remember to unblock the zip before unpacking (right click -> properties -> unblock)
Note that auto-theme is being discontinued in favor of the nxtheme format, all current links will still work but will only output .nxtheme files.