Qt5 support in O2

Added support for Qt5

Not much, except the following changes, was needed to support
Qt5:
* All query related QUrl API's have been put in a new class in
  Qt5 - QUrlQuery. The Qt5 specific code is kept under a #if
  for QT_VERSION >= 0x050000.
* QString::toAscii()/fromAscii() have been decprecated in favor
  of QString::toLatin1()/fromLatin1(). Since Latin1 is a superset
  of ASCII, it should be safe to change all calls of to/fromAscii
  to to/fromLatin1 w/o any Qt5 specific conditionals.

Bonus:
* Removed CRFL characters from simplecrypt.[h/cpp]