Also add a generic File_Diagram derived from zuMi's MS Visio diagram icon. Change-Id: I1208c8cf0af03d72baf5a23138c77fe4b0f3f451 Reviewed-on: https://review.haiku-os.org/c/haiku/+/11198 Reviewed-by: waddlesplash <[email protected]> Tested-by: Commit checker robot <[email protected]>