Added max level field to the trade query generator

[Kerberos9]

Useful when leveling or changing gear while not at a high level (for example, trying to buy rings at level 70 sometimes gets you level 80 atlas bases).

Description of the problem being solved:

Getting suggested items that you're not able to equip because of your level. This could also be expanded to stat requirements.

Steps taken to verify a working solution:

• Added a new EditControl to the query popup, next to the "Max Price" field.
• If the number is set and higher than 0, add the filter to the query.
• It does not set a default number since most people don't have to worry about this, but it's optional for leveling characters.

Before screenshot:

After screenshot: