Page loading improvements

[vixalien]

The primary target of this PR was to allow pages to be refreshed, but it turned into a yak shaving session. I improved the working of the Page and Navigation components, allowing easy refreshing. Here's a bit of elements on the TODO list.

• load directly on a Page
• reload directly on a Page
• Better error handling #102

Replace the current page when instead of pushing a new one:

• Search view (when a filter is applied)
• Library (when sort is changed)
• Library Playlists (ditto...)
• Library Albums
• Library Artists
• Library Subscriptions
• Library Songs
• Charts (when the country is changed)

I aim to allow most pages to be refreshed, but some pages don't need to be refreshed (I may be wrong).

Another thing to consider if it is a good idea to show the content page while reloading. Currently, the page is turned to the "loading" state while a reload happens. I would like to hear your input.

Pages with a reload function:

• Home
• Playlist
• Album
• Artist
• Search Results
• Library
• Library Playlists
• Library Albums
• Library Artists
• Library Subscriptions
• Library Songs
• History
• Artist Albums
• Channel
• Channel Playlists
• Explore
• Charts
• Moods and genres
• Mood
• New Releases
• Allow getting a new login code