dmapd: Initial commit

Based on existing AUR package: https://aur.archlinux.org/packages/dmapd/
dmapd: Major overhaul and cleanup of PKGBUILD

-Add original author as Maintainer
-Add myself as Contributor
-Add libexif as a depends (namcap was complaining)
-Clean up PKGBUILD variables to use quotes
-Set system config directory to /etc so dmapd can find its config (it is compiled as /usr/etc by default)
-Fix username in dmapd.conf to be compatible with Arch