Add change log for 1.9.0

Change-Id: I616ea6583f4f852601e174854432c3bf01b5fc7d
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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+# General
+* Setting module property values from the command line can now
+  be done per product.
+* Introduced new properties `qbs.architectures` and `qbs.buildVariants`
+  to allow product multiplexing by `qbs.architecture` and `qbs.buildVariant`,
+  respectively.
+* When rebuilding a project, the environment, project file and property
+  values are taken from the existing build graph.
+
+# Language
+* `Depends` items can now be parameterized to set special module parameters
+  for one particular product dependency. The new item type `Parameter`
+  is used to declare such parameters in a module. The new item type
+  `Parameters` is used to allow products to set default values for
+  such parameters in their `Export` item.
+* The functions `loadExtension` and `loadFile` have been deprecated and
+  will be removed in a future version. Use the `require` function instead.
+
+# Custom Rules and Commands
+* Artifacts corresponding to the `explicitlyDependsOn` property
+  are now available under this name in rules and commands.
+* A rule's `auxiliaryInputs` and `explicitlyDependsOn` tags
+  are now also matched against rules of dependencies, if these rules are
+  creating target artifacts.
+* Rules now have a property `requiresInputs`. If it is `false`, the rule will
+  be run even if no artifacts are present that match its input tags.
+* Added a new property `relevantEnvironmentVariables` to the `Command` class.
+  Use it if the command runs an external tool whose behavior can be
+  influenced by special environment variables.
+
+# C/C++ Support
+* Added the `cpp.link` parameter to enable library dependencies to be
+  excluded from linking.
+* When pulling in static library products, the new `Depends` parameter
+  `cpp.linkWholeArchive` can now be specified to force all the library's
+  objects into the target binary.
+* When pulling in library products, the new `Depends` parameter
+  `cpp.symbolLinkMode` can now be specified to control how the library
+  is linked into the target binary on Apple platforms: specifically,
+  whether the library is linked as weak, lazy, reexported, and/or
+  upward (see the `ld64` man page for more information).
+* The property `cpp.useCxxPrecompiledHeader`, as well as the variants for the
+  other languages, now defaults to true.
+
+# Apple
+* Added support for building macOS disk images.
+
+# Android
+* Product multiplexing is no longer done via profiles, but via architecture,
+  employing the new `qbs.architectures` property (see above). As a result,
+  the `setup-android` command now sets up only one profile, rather than
+  one for each architecture.
+* Added support for NDK Unified Headers.
+
+# Documentation
+* Added a "How-to" section.