feat(transparency): add ignore rules to config

This commit adds transparency_ignore_rules to the komorebi.json static
configuration format. Windows that match any rules given in this list
will not have transparency applied when they are unfocused.

For example, to ensure that a browser window is not made transparent
when the focused tab is a YouTube video:

```json
"transparency_ignore_rules": [
  {
    "kind": "Title",
    "id": "YouTube",
    "matching_strategy": "Contains"
  }
]
```

komorebi/src/lib.rs

@@ -130,6 +130,7 @@ lazy_static! {
             matching_strategy: Option::from(MatchingStrategy::Equals),
         }),
     ]));
+    static ref TRANSPARENCY_BLACKLIST: Arc<Mutex<Vec<MatchingRule>>> = Arc::new(Mutex::new(Vec::new()));
     static ref MONITOR_INDEX_PREFERENCES: Arc<Mutex<HashMap<usize, Rect>>> =
         Arc::new(Mutex::new(HashMap::new()));
     static ref DISPLAY_INDEX_PREFERENCES: Arc<Mutex<HashMap<usize, String>>> =