massive refactoring to switch from camelCase to snake_case:

historically, Libervia (SàT before) was using camelCase as allowed by PEP8 when using a
pre-PEP8 code, to use the same coding style as in Twisted.

However, snake_case is more readable and it's better to follow PEP8 best practices, so it
has been decided to move on full snake_case. Because Libervia has a huge codebase, this
ended with a ugly mix of camelCase and snake_case.

To fix that, this patch does a big refactoring by renaming every function and method
(including bridge) that are not coming from Twisted or Wokkel, to use fully snake_case.

This is a massive change, and may result in some bugs.

tests/unit/conftest.py

@@ -29,8 +29,8 @@ from sat.core import xmpp
 @fixture(scope="session")
 def bridge():
     bridge = AsyncMock()
-    bridge.addSignal = MagicMock()
-    bridge.addMethod = MagicMock()
+    bridge.add_signal = MagicMock()
+    bridge.add_method = MagicMock()
     return bridge
 
 
@@ -49,21 +49,21 @@ class MockSAT(SAT):
         self.profiles = {}
         self.plugins = {}
         # map for short name to whole namespace,
-        # extended by plugins with registerNamespace
+        # extended by plugins with register_namespace
         self.ns_map = {
             "x-data": xmpp.NS_X_DATA,
             "disco#info": xmpp.NS_DISCO_INFO,
         }
         self.memory = MagicMock()
         self.memory.storage = storage
-        self.memory.getConfig.side_effect = self.get_test_config
+        self.memory.config_get.side_effect = self.get_test_config
 
         self.trigger = trigger.TriggerManager()
         self.bridge = bridge
         defer.ensureDeferred(self._post_init())
         self.common_cache = AsyncMock()
         self._import_plugins()
-        self._addBaseMenus()
+        self._add_base_menus()
         self.initialised = defer.Deferred()
         self.initialised.callback(None)