remove ravenui.py by using plugin registry instead

main.py

@@ -10,7 +10,6 @@ import sys
 
 import constants
 from raven.pluginregistry import PluginRegistry
-from ravenui import RavenUI
 
 import gettext
 gettext.install('ravenlog', 'locale')
@@ -56,8 +55,8 @@ if __name__ == "__main__":
     PluginRegistry.load_plugin("NotesPlugin")
 
     window = PluginRegistry.execute_single("create_main_window")
-    RavenUI.window = window
     window.show()
+
     # window.open_file("/home/andi/ws/performanceDb/data/production/logs_2018-09-06_2018-09-06.csv")
     # window.open_file("/home/andi/ws/performanceDb/data/production/vapbdcom.csv")
     # window.open_file("/var/log/syslog")