Allow overriding preferred refresh rate, resolution and connection

for xrandr_facts module. You can set own preferences e.g. in a
host_vars/localhost.yml using the variables preferred_refreshrates,
preferred_resolutions and preferred_outputs (see
roles/yavdr-xorg/default/main.yml for default values).

roles/yavdr-xorg/defaults/main.yml

@@ -1 +1,16 @@
 first_run: False
+preferred_outputs:
+  - HDMI
+  - DP
+  - DVI
+  - VGA
+  - TV
+preferred_resolutions:
+  - 7680x4320
+  - 3840x2160
+  - 1920x1080
+  - 1280x720
+  - 720x576
+preferred_refreshrates:
+  - 50
+  - 60