String Concatenation

[RisingThumb]

Feature/enhancement description:
A way to concatenate strings for use with an export node would be useful.

Currently I have a project where I'm generating, from one stone texture, multiple colours of that stone texture and combining that with multiple different heightmap textures for a single output textures.

As a result, I'd have a group, pass in a suffix, say "blue" for it, since I pass in the blue stone texture into it, and then I'd like to concatenate that with something else in the export, i.e. "_bricks" so I'd get an output like "stone_blue_bricks.png". This would make exporting a lot of textures with colour variations much easier. As it is right now, I have to manually write all the different export names.

An example of this being done for a different project is in Makkon's textures for Quake where there's a lot of base variants(bricks, cracked stone, trimsheets etc) and these are combined with a lot of different colour variants.

One way I can think of doing this, could be similar to how blend nodes have a button for multiple ports, a button for multiple suffixes so you can feed in suffixes from the group's linked parameters?