* now license-header.sh is POSIX compliant
* update-icons now checks for dependencies the correct way
* add --help to license-header
* nuke reset-submodules
* add missing shebang to .ci/windows/package.sh
* Below the error/warnings/infos from shellcheck:
-- SC2068 (error): Double quote array expansions to avoid re-splitting elements.
-- SC3054 (warning): In POSIX sh, array references are undefined.
-- SC2155 (warning): Declare and assign separately to avoid masking return values.
-- SC2046 (warning): Quote this to prevent word splitting.
-- SC2236 (style): Use -n instead of ! -z.
-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.
-- SC2001 (style): See if you can use ${variable//search/replace} instead.
-- SC2086 (info): Double quote to prevent globbing and word splitting.
-- SC2185 (info): Some finds don't have a default path. Specify '.' explicitly.
Signed-off-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
