Moved all the recipes that weren't actually recipes to addons.

recipes/boost/recipe.py

@@ -5,7 +5,7 @@ from SCons.Script import *
 def cook(env: Environment, version: str = "1.85.0") -> dict:
     # TODO: build binaries?
     url = f'https://archives.boost.io/release/{version}/source/boost_{version.replace(".", "_")}.tar.gz'
-    repo = env.Cook('DownloadAndExtract', f'boost_{version}', url = url, skip_folders = 1)
+    repo = env.DownloadAndExtract(f'boost_{version}', url = url, skip_folders = 1)
     checkout_root = repo['extracted_root']
     return {
         'CPPPATH': [checkout_root]