[Dicson] use manifest.ini files in plugins to have a separate file for plugin's information. Fixes #5920

Also use sed to remove now unneeded Vim lines, 2to3 -f ws_comma to fix
some whitespace, and fix some other madness manually.

Fixed log_calls decorator arguments in a few plugins. Fixed Acronyms Expander plugin (not working due to bad auto-merge). Added few comments.

Google Translation plugin added (proof-of-concept) that translates incoming chat messages from English to French using Google Translate service.
Plugin object that registered new event is accessible in that event now, through self.plugin.