add regen dependency on script modules

fix embedded_get in non bootstrapped mode

analyzer improvements

fix warning

add productType to native target section

add build files to xcode targets

fix xcode defines

process target args in a preprocessing step

allow disabling pkgconf lookup in bootstrap.sh

remove iterator

expose build_dep_merge

clean up some includes

use ca prefix for common_args functions

use --keep-system-libs in bootstrap.sh

This fixes notably linking pkgconf installed by homebrew where the
system lib is not really a system lib.

xcode backend improvements

initial xcode backend

fix module cache not caching across schemas

only warn about shallow clone without full sha

suprojects update: return error on failures

remove symlinks with fs_rmdir