Add vertical scroll bar to sidebar in GTK UI

[anonymous]

Problem:

Using a 1024x768 screen resolution & having around 45+ active torrents and 6+ trackers with the sidebar visible the size of the details tab at the bottom gets squished down too much.

The required vertical height of the sidebar is so big there isn't enough space left at the bottom.

I'd like to turn on labels - but that makes the bottom panel too small to use.

Suggested Solution(s):

• Add a vertical scrollbar to the sidebar and not display the entire sidebar
  

• Enable expanding / collapsing status, tracker (and with label plug-in label) sections to reduce required vertical real estate for sidebar.

[andar]

A scrolled window is now in use in the sidebar.

[(none)]

Milestone 1.1.0 deleted