Rename ssl and auth configuration file settings.

Add enable SSL config validator.
Strict configuration file validation: any error will prevent the server to start.
Core server logic moved to a Server class.

.gitignore

@@ -8,6 +8,9 @@ __pycache__
 # environment file
 .env
 
+# hypothesis files
+.hypothesis
+
 # C extensions
 *.so
 
@@ -62,4 +65,5 @@ startup.vpcs
 # Virtualenv
 env
 venv
+*venv
 .ropeproject