Ports: Switch to new ports system (#594)

Much redundancy is removed from package scripts with this system.
It also supports simple dependency management, uninstalling (through
BSD ports style plist files), cleaning up after itself (with clean,
clean_dist, clean_all commands), etc.

Ports/doom/doom.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-PORT_DIR=SerenityDOOM
-fetch() {
-    run_fetch_git "https://github.com/SerenityOS/SerenityDOOM.git"
-}
-configure() {
-    echo ""
-}
-build() {
-    run_make -C doomgeneric/
-}
-install() {
-    run_make_install -C doomgeneric/ DESTDIR="$SERENITY_ROOT"/Root
-}
-. ../.port_include.sh

Ports/doom/package.sh

@@ -0,0 +1,8 @@
+#!/bin/bash ../.port_include.sh
+port=doom
+workdir=SerenityDOOM-master
+version=serenity-git
+curlopts="-L"
+files="https://github.com/SerenityOS/SerenityDOOM/archive/master.tar.gz doom-git.tar.gz"
+makeopts="-C doomgeneric/"
+installopts="-C doomgeneric/"