With this combo box become easier to make.
You can set a first default value to show to the user with last argument, by default if not set it will be 0 (first entry).
following what the filters list did and made it easier so anyone could use them without having to create many lines.
This will be used later in another PR, but also made Filter list follow scheme of other type of ImGui items :)
(it still need reload.)

PS: Right now in the combo box array you can not have a single character entry that how I check if that a valid entry, also if anyone know how I can get the size of the array in the function that would solve this issue