Sling Resprites (#21538)

* DB texture on back changed

* cheese

* test

* CR20 Syndie Sling

* NT slings implemented

* finished SMGS, starting on Laser Weapons

* added more laser slings

* laser weapons done

* small changes to laser weapons and pie cannon slings

* added chinalake and l6 slings

* finished launcher catagory, almost finished rifle catagory

* almost done, just missing the heavy sniper

* Replaced L6, Chinalake and Heavy Sniper resprite because my old heavy sling was ugly af

* all slings done

* added copyright to the .meta files

* Revert "cheese"

This reverts commit a1f7ac7b70709a6789a7b6fc0dc00a2c0734b83a.

* fixed sln file, in theory at least

Resources/Textures/Objects/Weapons/Guns/SMGs/c20r.rsi/meta.json

@@ -1,7 +1,7 @@
 {
     "version": 1,
     "license": "CC-BY-SA-3.0",
-    "copyright": "Taken/modified from tgstation at https://github.com/tgstation/tgstation/pull/41804/commits/1baf679a544505960cebd071425f1df60669cdf3, backpack sprite by Peptide",
+    "copyright": "Taken/modified from tgstation at https://github.com/tgstation/tgstation/pull/41804/commits/1baf679a544505960cebd071425f1df60669cdf3, backpack sprite by Peptide, backpack sling sprite edited by Boaz1111",
     "size": {
         "x": 32,
         "y": 32