i18n: Moved translation files into flask compatible folder
views/search: Converted to blueprint
views/i18n,login: Added register() functions
views: Added register() function
flask: Import cleanup
flask: Moved user_loader into views.login module
templates: Replaced tg templates by flask variants
flask: Moved code to assets.environment
flask: Load config from SKYLINES_CONFIG envvar if available
flask: Replace create_app() function by SkyLines class
flask: Added inject_tg2_compat() method
flask: Added register_views() method
flask: Added comments
flask: Added wrap_toscawidgets_middleware() method
flask: Simplified WSGI server run call
flask: Added add_*() methods
flask: Moved extension imports into methods

There is no need to import these modules if we don't use them
flask: Added add_web_components() method
flask: Call register_views() from add_web_components()
flask: Converted comments to docstrings