Added recipes for fmt and magic_enum.

recipes/magic_enum/recipe.py

@@ -0,0 +1,10 @@
+
+import os
+from SCons.Script import *
+
+def cook(env: Environment, git_ref: str = "master") -> dict:
+    repo = env.Cook('GitBranch', repo_name = 'magic_enum', remote_url = 'https://github.com/Neargye/magic_enum.git', git_ref = git_ref)
+    checkout_root = repo['checkout_root']
+    return {
+        'CPPPATH': [os.path.join(checkout_root, 'include')]
+    }