yml: Move json schema from python dict to standalone json file

- Easier to reference as schema for IDEs
- Can be added to schemastore.org

Signed-off-by: ciarancourtney <ciaran.courtney@activeenergy.ie>
[Jan: rebased, merged in schema installation]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

setup.py

@@ -78,6 +78,9 @@ setup(
 
     packages=find_packages(),
 
+    package_data={'kas': ['*.json']},
+    include_package_data=True,
+
     entry_points={
         'console_scripts': [
             'kas=kas.kas:main',