logging: cli options to filter for modules using -v

old style "-v" still works

filtering examples:
-v=debug,network=error,interface=error      // effectively blacklists network and interface
-v=warning,network=debug,interface=debug    // effectively whitelists network and interface

electrum/plugin.py

@@ -47,7 +47,6 @@ hooks = {}
 
 
 class Plugins(DaemonThread):
-    verbosity_filter = 'p'
 
     @profiler
     def __init__(self, config: SimpleConfig, gui_name):