[theme] Add YAML as optional format for themes

This addresses issue #4

bumblebee/themes/default.yaml

@@ -0,0 +1,60 @@
+defaults: 
+ prefix: " "
+ suffix: " "
+ urgent: true
+ fg: "#aabbcc"
+date: 
+ prefix: " "
+time: 
+ prefix: " "
+memory: 
+ prefix: " ram "
+cpu: 
+ prefix: " cpu "
+disk: 
+ prefix: " hdd "
+dnf: 
+ prefix: " dnf "
+pasink: 
+ states: 
+  muted: 
+   prefix: " audio(mute) "
+  unmuted: 
+   prefix: " audio "
+pasource: 
+ states: 
+  muted: 
+   prefix: " mic(mute) "
+  unmuted: 
+   prefix: " mic "
+nic: 
+ states: 
+  "wireless-up": 
+   prefix: " wifi "
+  "wireless-down": 
+   prefix: " wifi "
+  "wired-up": 
+   prefix: " lan "
+  "wired-down": 
+   prefix: " lan "
+  "tunnel-up": 
+   prefix: " tun "
+  "tunnel-down": 
+   prefix: " tun "
+battery: 
+ states: 
+  charged: 
+   suffix: " full "
+  charging: 
+   suffix: " chr "
+  discharging_critical: 
+   prefix: " ! "
+   suffix: " dis "
+  discharging_low: 
+   suffix: " dis "
+  discharging_medium: 
+   suffix: " dis "
+  discharging_high: 
+   suffix: " dis "
+  discharging_full: 
+   suffix: " dis "