Refactor module naming and update references to steamcache2

- Changed module name from `s1d3sw1ped/SteamCache2` to `s1d3sw1ped/steamcache2` for consistency.
- Updated all import paths and references throughout the codebase to reflect the new module name.
- Adjusted README and Makefile to use the updated module name, ensuring clarity in usage instructions.

.goreleaser.yaml

@@ -11,8 +11,8 @@ builds:
       - -s
       - -w
       - -extldflags "-static"
-      - -X s1d3sw1ped/SteamCache2/version.Version={{.Version}}
-      - -X s1d3sw1ped/SteamCache2/version.Date={{.Date}}
+      - -X s1d3sw1ped/steamcache2/version.Version={{.Version}}
+      - -X s1d3sw1ped/steamcache2/version.Date={{.Date}}
     env:
       - CGO_ENABLED=0
     goos: