Reproject flow and UI changes

[jiajasper]

Reproject flow:

1. All configuration options are empty by default and reproject button disabled by default

2. When configurations are set, reproject button becomes enabled

3. New tabs open after reproject clicked - we highlight the newly opened tab at first when there is yet a mouse click detected in the viewport. We also add "*" after the file name in the tab to indicate that this is a modified version of the texture and there will be no "go back" button to return to the editor from a reprojected texture.

4. As soon as the first mouse click is detected in the viewport, we de-highlight the tab

Figma link for full flow: https://www.figma.com/file/tgjz0PLgrPoJ9gh6nqkNGw/PlayCanvas-Texture-Viewer?node-id=14%3A292