Smart search

Currently, Symbol Finder uses exact match to search symbol in Sketch. That will be good if the plugin using smart search to help user find expected symbol.

### Input:
Provided symbol name from Sketch is separated by `/` for descendant symbols. For example
```
Button / Filled / Main
Button / Filled / Secondary
Button / Ghost / Main
```

Search string:
```
button filled
```

### Current output:
`null`

### Expected output:
```
Button / Filled / Main
Button / Filled / Secondary
```