Order plugins by weight instead of name

Problem/Motivation

In the field admin interface, plugins are listed by weight but this weight is not used when calling the format callbacks because they are called by the alphabetical order of the plugins names. It works perfecttly with the given plugins because, magic, their names follow their weights (except for the organization one). This can lead to issues when using custom plugins to alter some fields (even if you don't want us to do this, we need to).

Proposed resolution

Use plugins weights instead of alphabetical order.