Adjust setuptools for the legendary submodule

MANIFEST.in

@@ -3,4 +3,3 @@ include rare/languages/*.qm
 include rare/resources/images/*
 recursive-include rare/resources/stylesheets/* *
 include rare/resources/colors/*
-recursive-include legendary/* *

setup.py

@@ -32,7 +32,8 @@ setuptools.setup(
     long_description_content_type="text/markdown",
     include_package_data=True,
     url="https://github.com/Dummerle/Rare",
-    packages=setuptools.find_packages(),
+    packages=setuptools.find_packages() + setuptools.find_packages(where='legendary'),
+    package_dir={'rare': 'rare', '': 'legendary'},
     classifiers=[
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.8",