[Feature Request] Replace Texture Button

This is mainly a quality of life request which would help with efficiency.

I recall there being away a long time ago with the old texture editor to replace images, this was a really nice feature for custom textures when testing them.

However, The current way it has to be done is to name the texture the same name, delete the texture that MCreator has and then import a new custom texture.

It would be nice if we could just select the texture in the texture window as if we were going to delete it then replace it with an image from our computer.

This skips the naming and deleting steps needed to update the texture and make it easier without needed to worry about getting the name wrong when naming it.

However it is up to the contributors if they wish to add it or not but, it's been something I have really wanted since the replace function from the texture editor has been removed.