Fixed src/tools/qglobal causing clang build failure, and updated the include/ qglobal.h

Pull in bugfixes from main.

Check that forwardStack in QTextBrowser is not empty to avoid segfault

Closes #2

See merge request !2

First release of Osiris

See merge request !1

Fix memory leaks and other minor issues

Removed from makefiles and configure script

Removed obsolete libraries and updated configure script to always use
host versions

- Cleaned up unnecessary configs
- Fixed configure script
- Fixed Linux configs for freetype2 support
- Fixed threads support in Linux configs
- Other misc fixes
- Changed defaults for configure script

Avoid potential conflicts with existing Qt installations