Remove `bootstrap-colorpicker` package

[nedyalka]

Remove itsjavi/bootstrap-colorpicker package (https://packagist.org/packages/itsjavi/bootstrap-colorpicker) because it is abandoned and most likely its github repo has been deleted which is causing problems on composer install.
Also review all packages and remove/replace the abandoned ones if there are any.

[pnikolov]

Thanks for reporting, it will be part of a minor future release.