In order to be compatible with the Matrix terminology

Add NSIS installer

fix dll issues

fix openssl dll issues

- Create QApplication instance before font initialization, otherwise
  QFontDatabase crashes.
- Fix broken QRC font paths

Change windows build to Release

- Add border width on Badge

Each HistoryView maintains a list of pending events. Each pending
message is validated from the homeserver with either the returned
EventId or the body of the message.

Currently there is no support to remove invalid messages.

Also some small refactoring:
    - ChatPage doesn't know about the message being sent. The message
      delivery is solely handled by HistoryViewManager.
    - Nick coloring function moved to HistoryViewManager.

Tone down the main text color