v0.2.3 fixes some annoying bugs.

- Portraits can now be loaded in a variety of image formats including BMP, TGA, WebP & JPEG.
- Portrait renaming now disallows and warns the user if they are naming it the same name as an entry that already exists.
        This is because it currently uses the name as it's unique identifier.
- Pressing 'enter' while in the next key entry area will then view that key and create it if necessary. (Same as pressing the 'next' button)
- When a new branch is created, the previous key name display will now update with the previous message key name.
- Fixed initial vertical scroll due to the size being perceived at an incorrect initial zoom level.