Help: Add a style guide.
Help: Mark up references to NEW and OLD policy settings properly.
Help: Use ``inline-literals`` to mark generator expressions.
Help: Add hyperlink targets to some manual sections.

These can be refered to from the command documentation and other
relevant locations.
Help: Specify how to order and modify transitively set property values.
Help: Note that the compatible interface properties must not intersect.
Help: Mark up the buildsystem commands documentation

Cross-link to the cmake-buildsystem manual.
Help: Document relation of properties to the rest of the buildsystem.
Help: Use ``True`` and ``False`` for IMPORTED values.

Only the first letter is capitalized. It is marked up.
Help: Adjust the QtAutogen properties to the common style.

Link to the cmake-qt manual.
Merge topic 'update-buildsystem-docs' into next

fd48197e Help: Adjust the QtAutogen properties to the common style.
f05af88c Help: Use ``True`` and ``False`` for IMPORTED values.
8d588c64 Help: Document relation of properties to the rest of the buildsystem.
bd158497 Help: Mark up the buildsystem commands documentation
bf7fdd49 Help: Note that the compatible interface properties must not intersect.
385a3f87 Help: Specify how to order and modify transitively set property values.
2d5fc224 Help: Add hyperlink targets to some manual sections.
4475706a Help: Use ``inline-literals`` to mark generator expressions.
225fc1e2 Help: Mark up references to NEW and OLD policy settings properly.
fc1d7556 Help: Add a style guide.
13fd94ae Help: Fix typos