Move download options from Settings menu to a contextually sensitive place (Download render profile in render dialog, etc).

GHNS (KDE's Get Hot New Stuff) allows to download user created content, like luma transitions, keyboard shortcut layout, rendering profiles, title templates. Currently, all these options are grouped in the "Settings menu", under Download...

The idea is to move them where it makes more sense:

• "Download render profiles" in the render dialog,
• "Download title templates" in the titler widget,
• "Download luma files" in the transition list widget
• "Download keyboard shortcuts in the shortcuts dialog (this one might not be possible)