Crudely fix Qt6 compatibility in debug build
Fix compiler warning
Sigh - restore compatibility with Qt < 5.14 (I hope)
Fix some compiler warnings
Add importString/loadString functions; fix some memory leaks; update to avoid deprecated APIs; tidy in a few places
Avoid compiler warning for deprecated API we can't readily replace
Catch exceptions by reference
Fix compiler warnings
Remove staticlib, restore dynamic libs!
Added tag v0.9.1 for changeset 768fb9b05355
Update to C++11, and make a fix to throw-from-dtor logic (i.e. don't do it) along with a few other compile and warning fixes.
Meta + config
Rename DEBUG to DQ_DEBUG (as DEBUG is often used as a flag). Also fix some warnings.
win32 target name
Actually, I think we have to do percent encoding ourselves (QUrls converted to strings are de-encoded)