restructure project for packaging

setup.py

@@ -1,11 +1,14 @@
-from setuptools import setup, find_packages
+from setuptools import setup, find_namespace_packages
 from owrx.version import strictversion
 
 setup(
     name="OpenWebRX",
     version=str(strictversion),
-    packages=find_packages(),
-    entry_points={"console_scripts": ["openwebrx=openwebrx:main"]},
+    packages=find_namespace_packages(include=["owrx", "csdr", "htdocs"]),
+    package_data={
+        "htdocs": ["*", "**/*"]
+    },
+    entry_points={"console_scripts": ["openwebrx=owrx.__main__:main"]},
     # use the github page for now
     url="https://github.com/jketterl/openwebrx",
     author="András Retzler, Jakob Ketterl",
@@ -13,4 +16,5 @@ setup(
     maintainer="Jakob Ketterl",
     maintainer_email="jakob.ketterl@gmx.de",
     license="GAGPL",
+    python_requires=">=3.6",
 )