Menu improvements

- Standard menu check marks instead of palm emoji
- “Enable Format on Save” & “Disable Format on Save” instead of check mark emoji
- Title capitalization
- Renamed some menu items
- Xcode refers to “active” file as file in “focus” (for example, take a look at “Navigate” menu: “Move Focus To Next Area”, etc.)
Merge pull request #7 from antons/master

Menu improvements