v1.0.0rc4

1.0.0rc4: fixes from the rc3 test, and GNOME

Release candidate for 1.0.0, for testing. A player on rc3 is offered this one by its UPDATE button.

• The playlist is newest first: a song just composed is at the top.
• Auto-generated songs are named (auto) <Title>.it, the mark in front, so a file browser sorts them together. Older … (auto).it files still count as auto-generated and rotate out.
• A launch while a player is already running puts the app-menu entry back before handing off to it.
• GNOME (tested on GNOME Shell 50): the window fits itself once its layout settles; the music folder is the desktop's own Music folder; without a system tray, start at login runs in the background (the media keys and GNOME's media card reach it) and opening bitComposer from the app grid shows the window; a second launch passes GNOME's activation token so the window comes forward instead of an "is ready" notification.

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