adding fmt third_party library + adding cloc support

.clocignore

@@ -0,0 +1,8 @@
+third_party
+build
+__dump
+traces
+.vscode
+.claude
+.git
+imgui.ini

.gitmodules

@@ -14,3 +14,6 @@
 [submodule "third_party/ImGuizmo"]
 	path = third_party/ImGuizmo
 	url = https://github.com/CedricGuillemet/ImGuizmo.git
+[submodule "third_party/fmt"]
+	path = third_party/fmt
+	url = https://github.com/fmtlib/fmt

bin/dev

@@ -96,6 +96,13 @@ class DevCommand(GiteaCommand, RenderDocCommand, ShadersCommand, TracyCommand):
 
     # Custom helpers
 
+    ##
+    # Counts lines of code from the project root, skipping paths listed in
+    # .clocignore. Any arguments are passed through to cloc.
+    #   dev cloc [args...]
+    def cloc(self, *args, **kwargs):
+        self._run_in_root(["cloc", "--exclude-list-file=.clocignore", *args, "."])
+
     def ownit(self, *args, **kwargs):
         file_or_directory = args[0] if args else None
         if file_or_directory is None: