Send favicon generation request, get the answer and unzip the pictures
Master picture can now be passed inline, as base64
Favicon generation request is now passed from the plugin to the API
HTML code is injected in target pages
Task now handles favicon parameters
Task params refactored
Dedicated pictures, compression and scaling algorithms now taken into account
Error codes from server are now handled
Expected pictures updated for actual RFG server (ImageMagick was not exactly the same version)