Re-arrange the directory structure.

Now that we're using the custom directory, we no longer need to seperate
so many files.

cfg/engineer.cfg

@@ -1 +1,23 @@
-exec scripts/classes/engineer.cfg
+// Engineer Scripting
+
+exec _reset.cfg
+
+// Engineer Music
+// Plays "More Gun" on first class load.
+engineer_music
+
+
+// Buildings
+// Key 6-9 automatically destroy the associated building if it already exists,
+// then selects the relevant building blueprint, ready to be built.
+alias key6 "destroy 2 0; build 2 0;"  // Sentry Gun
+alias key7 "destroy 0 0; build 0 0;"  // Dispenser
+alias key8 "destroy 1 0; build 1 0;"  // Teleporter Entrance
+alias key9 "destroy 1 1; build 1 1;"  // Teleporter Exit
+
+
+// PDA
+// Enables or disables the Engineer's PDA.
+alias pda_on "alias key4 slot4; bind 4 key4; alias key5 slot5; bind 5 key5"
+alias pda_off "unbind 4; unbind 5;"
+ENGINEER_PDA