functions: introduce add_runscript

This function adds a runtime script to the /hooks directory on the
initramfs image. Note that this function will also install hooks with
executable permissions for use by a later change to early init.

With this commit, there are now methods available which can be used in
place of the MODULES, FILES, BINARIES, and SCRIPT variables, as we now
offer error checking on the add_* functions. Usage of the variables is
deprecated, and these will no longer be read in a future version of
mkinitcpio.

This commit also lays the groundwork for the addition of more early
userspace hooks. Runtime hook files are parsed for specific functions
and variables (not yet used) are populated. These will eventually be
written to the image config so that early userspace knows exactly
what to run.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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