Rename project to sacredK

sacred_re.dll/.exe/.ini/.log/_crash files are now sacredK.*; inventory saves
with the old "sacred_re.inventory" format id still load.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/mods/sharedchest.cpp

@@ -334,7 +334,7 @@ void Save() {
             }
         }
     }
-    const json j = {{"format", "sacred_re.shared_chest"}, {"version", kFileVersion}, {"items", items}};
+    const json j = {{"format", "sacredK.shared_chest"}, {"version", kFileVersion}, {"items", items}};
     const std::string path = FilePath();
     const std::string temp = path + ".tmp";
     {