Exporting multiple spritesheet doesn't allow custom pattern on file name

[Junarox]

When you generate multiple spritesheets from a single array of images, by default the export names ends up with the "-0" "-1" "-2" pattern.

Example: If u have an array of images that compose an animation but it dont fit the size, it will generate the file names as follow: "animation-0.png", "animation-1.png", etc.

Would be nice to have a custom pattern like "_0" instead of "-0".

Maybe specify the pattern on the Texture name with brackets, like: animation{_$} where the brackets indicates the start of the pattern, and the currency symbol indicates the numbers (0,1,2,etc).