Sailfish port use TextSwitch instead of popup when use TwitLonger

"get rid of" the twitlonger popup dialog in newtweetpage and replace it with TextSwitch notice that I could not test twitlonger posts since I get error 400 this is also the case in old version so not a regression because of my change.

UI change:

Switch is shown only if >140 and setting.twitlonger is active. Longer description is only shown if not checked. This is to save screen space. Also image hidden but only if textlonger is not checked and text longer > 140 chars.

hopefully this change make it easier to get rid of the "twitt button" later and use swipe instead...