Fix keyboard focus and add better keyboard navigation

[Fabian Kosmale]

1. Make sure that the right component has the focus
2. PgUp/PgDown should jump to prev/next part
3. Move forward when space is pressed.

[Fabian Kosmale]

better ked navigation in part reader, re #9

→ <<cset 0cc5169b4e67>>

[Fabian Kosmale]

improve keyboard navigation by setting the focus

re #9

→ <<cset 8afa651937f4>>

[Fabian Kosmale]

make listview navigatable via keys

re #9

→ <<cset a973bafbb081>>

[Fabian Kosmale]

Rename VolumesView to the more fitting AllSeriesView enhance keyboard navigation on VolumesView by setting up tab navigation re #9

→ <<cset 1ebdd714aa0f>>

[Fabian Kosmale]

try to integrate bookview into tab chain, re #9

→ <<cset 79cb2f71b556>>