Fix *.props files usage across all projects (WIP)

- [x] Merge common properties for all VSFilter projects
- [ ] Remove redundant properties in VSFilter.props (i.e. already set in common.props), and make use of common.props in VSFilter projects
- [ ] Use common.props where possible in other projects (like test, gtest and log4cplus)
- [ ] Remove redundant properties in projects that already use common.props