[Form] Camelize 'add' and 'remove' methods in the PropertyPath
[Form] Camelize 'add' and 'remove' methods in the PropertyPath

This issue camelizes the 'add' and 'remove' methods,
as it is already done with the 'set' method.
This fixes a problem with properties like 'custom_messages',
where the 'add' and 'remove' methods are 'addCustom_message'
and 'removeCustom_message' instead of 'addCustomMessage'
and 'removeCustomMessage'.

symfony/Form