server: don't wait anymore for libervia app to be fully started: following change in backend, libervia app are started and the loading workflow continue immediately, the proxy is created only when the app is known to be actually started (through the `application_started` signal or a flag received when starting the application). This avoid stopping the loading of website for a long time, or breaking when a timeout is reached.

include MANIFEST.in libervia/VERSION
global-include *.py
global-include *.ini
global-include *.po *.mo
global-include CHANGELOG COPYING* INSTALL README*
global-include *.sh
global-include Makefile *.rst *.bat
include src/browser/public/*
include themes
include doc
recursive-include src *.js
exclude *.sh
global-exclude *.un~
global-exclude *.pyc
prune output
prune html