Milestone Gobby 0.3.0

Version 0.3.0:

• This release depends on net6 1.2.0 and obby 0.3.0, it is *not* backwards-compatible protocol-wise to the 0.2.x series.
• No more pending changes due to the new merging algorithm
• Cursor is left-gravity now, which relieves some problems with newlines
• Joins are now threaded and thus abortable
• Connection status is displayed in the status bar
• Lines in the chat log are now wrapped to the display width
• Session serialisation and restore
• Name and colour could be changed directly when they are already in use
• User and document list are now separate windows, their position and state is preserved by default
• Close document now just unsubscribes from the document
• Scrollable document folder
• Search and replace
• New translations:
  • Swedish (complete)
  • Catalan (partial)
  • Chinese (partial)
  • Spanish (almost complete)