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.

sat/tools/common/data_objects.py

@@ -43,7 +43,7 @@ class Message(object):
         self._subject_data = msg_data[5]
         self._type = msg_data[6]
         self._extra = data_format.deserialise(msg_data[7])
-        self._html = dict(data_format.getSubDict("xhtml", self._extra))
+        self._html = dict(data_format.get_sub_dict("xhtml", self._extra))
 
     @property
     def id(self):
@@ -203,7 +203,7 @@ class OnClick(object):
     def __init__(self, url=None):
         self.url = url
 
-    def formatUrl(self, *args, **kwargs):
+    def format_url(self, *args, **kwargs):
         """format URL using Python formatting
 
         values will be quoted before being used