Method: Lightens/darkens a given colour (hex format), returning the altered colour in hex format.
Method: Fill gradient.
Filter Hook: Filters avatar addon colors.
Method: Register options of Avatar addon.
Method: Get center position on image.
Method: Convert hex value to rgb.
Method: Function to generate letter avatar
Method: File name of a avatar.
Method: Return url to avatar.
Method: Return avatar file path.