- Removed obsolete Boost disable autolink patch (Wt no longer uses
   autolinking for recent Boost versions)
 - Removed obsolete OpenSSL patch (Wt switched to using the
   standard CMake FindOpenSSL module)
 - Listed all Boost dependencies based on which Boost headers Wt uses
 - Added optional GraphicsMagick dependency for WRasterImage on
   non-Windows
 - Added libharu dependency for WPdfImage
 - Limited Pango dependency to only non-Windows (on Windows DirectWrite
   is used), added a tweak so it finds Harfbuzz and added it to
   Build-Depends
 - Added feature switches for Dbo and its backends: Sqlite3, PostgreSQL,
   and MS SQL Server, and for OpenSSL
 - Explicitly disabled BUILD_TESTS, ENABLE_FIREBIRD, and ENABLE_QT5
 - Reenabled libwttest