chore: update project references and add Citron copyright

- Replaced all references to the old project name with Citron.
- Added Citron copyright information alongside existing notices in all files.

vcpkg.json

@@ -1,6 +1,6 @@
 {
     "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
-    "name": "yuzu",
+    "name": "citron",
     "builtin-baseline": "a42af01b72c28a8e1d7b48107b33e4f286a55ef6",
     "version": "1.0",
     "dependencies": [
@@ -29,7 +29,7 @@
         "zstd"
     ],
     "features": {
-        "yuzu-tests": {
+        "citron-tests": {
             "description": "Compile tests",
             "dependencies": [ "catch2" ]
         },