New Pokemon can be created by importing data from another Pokemon

[Aelysya]

Description

The user can now create a new Pokémon by importing data from another existing Pokémon.
All forms' data will be the same as the imported Pokémon, except for the base form which will have the types chosen in the editor.

closes #457

Tests to perform

Open the "New Pokémon" editor

Creating a new Pokémon without importing any data

• Fill the basic data and create the Pokémon => only the basic data is filled for the new Pokémon, all other data are filled with default values
• Fill the basic data, un-collapse the "other data" component, leave the selection on "None" and create the Pokémon => only the basic data is filled for the new Pokémon, all other data are filled with default values
• Fill the basic data, un-collapse the "other data" component, select a Pokémon, re-collapse the "other data" component and create the Pokémon => only the basic data is filled for the new Pokémon, all other data are filled with default values

Creating a new Pokémon by importing data

• Fill the basic data, un-collapse the "other data" component, select a Pokémon and create the Pokémon => the basic data is filled for the new Pokémon with the information you entered AND all other data are filled with the same data as the chosen Pokémon
• Test with a Pokémon that only has 1 base form
• Test with a Pokémon that has multiple forms

[AerunDev]

Testé et approuvé ! 🎉
Bien joué, ça va vraiment faciliter les choses pour les utilisateurs, c'est top !

Tests effectués :

• Tests classiques de création d'un nouveau Pokémon.
• Création d'un nouveau Pokémon sur la base de Zarbi, tout est OK.
• Création d'un nouveau Pokémon sur la base de Rattata, tout est OK.