VS: Add support for Windows 10 Universal (Store) Applications

Teach the VS 2015 generator to support WindowsStore 10.0 applications.
Add target properties to customize them:

* VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION: Specifies the minimum version
  of the OS that the project can target.

* VS_DESKTOP_EXTENSIONS_VERSION, VS_MOBILE_EXTENSIONS_VERSIONS,
  VS_IOT_EXTENSIONS_VERSION: Add a reference to the version of the SDK
  specified to the target allowing to target the extended functionality in
  a universal project.

* VS_IOT_STARTUP_TASK: Specifies that the target should be
  built as an IOT continuous background task.

5 files changed, 46 insertions, 0 deletions

diff --git a/Help/prop_tgt/VS_DESKTOP_EXTENSIONS_VERSION.rst b/Help/prop_tgt/VS_DESKTOP_EXTENSIONS_VERSION.rst
new file mode 100644
index 0000000..19d1620
--- /dev/null
+++ b/Help/prop_tgt/VS_DESKTOP_EXTENSIONS_VERSION.rst
@@ -0,0 +1,10 @@
+VS_DESKTOP_EXTENSIONS_VERSION
+-----------------------------
+
+Visual Studio Windows 10 Desktop Extensions Version
+
+Specifies the version of the Desktop Extensions that should be included in the
+target. For example ``10.0.10240.0``. If the value is not specified, the Desktop
+Extensions will not be included. To use the same version of the extensions as
+the Windows 10 SDK that is being used, you can use the
+:variable:`CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION` variable.
diff --git a/Help/prop_tgt/VS_IOT_EXTENSIONS_VERSION.rst b/Help/prop_tgt/VS_IOT_EXTENSIONS_VERSION.rst
new file mode 100644
index 0000000..27c8a3d
--- /dev/null
+++ b/Help/prop_tgt/VS_IOT_EXTENSIONS_VERSION.rst
@@ -0,0 +1,10 @@
+VS_IOT_EXTENSIONS_VERSION
+-------------------------
+
+Visual Studio Windows 10 IoT Extensions Version
+
+Specifies the version of the IoT Extensions that should be included in the
+target. For example ``10.0.10240.0``. If the value is not specified, the IoT
+Extensions will not be included. To use the same version of the extensions as
+the Windows 10 SDK that is being used, you can use the
+:variable:`CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION` variable.
diff --git a/Help/prop_tgt/VS_IOT_STARTUP_TASK.rst b/Help/prop_tgt/VS_IOT_STARTUP_TASK.rst
new file mode 100644
index 0000000..add50cb
--- /dev/null
+++ b/Help/prop_tgt/VS_IOT_STARTUP_TASK.rst
@@ -0,0 +1,6 @@
+VS_IOT_STARTUP_TASK
+-------------------
+
+Visual Studio Windows 10 IoT Continuous Background Task
+
+Specifies that the target should be compiled as a Continuous Background Task library.
diff --git a/Help/prop_tgt/VS_MOBILE_EXTENSIONS_VERSION.rst b/Help/prop_tgt/VS_MOBILE_EXTENSIONS_VERSION.rst
new file mode 100644
index 0000000..be3c9a0
--- /dev/null
+++ b/Help/prop_tgt/VS_MOBILE_EXTENSIONS_VERSION.rst
@@ -0,0 +1,10 @@
+VS_MOBILE_EXTENSIONS_VERSION
+----------------------------
+
+Visual Studio Windows 10 Mobile Extensions Version
+
+Specifies the version of the Mobile Extensions that should be included in the
+target. For example ``10.0.10240.0``. If the value is not specified, the Mobile
+Extensions will not be included. To use the same version of the extensions as
+the Windows 10 SDK that is being used, you can use the
+:variable:`CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION` variable.
diff --git a/Help/prop_tgt/VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION.rst b/Help/prop_tgt/VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION.rst
new file mode 100644
index 0000000..1ad7a71
--- /dev/null
+++ b/Help/prop_tgt/VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION.rst
@@ -0,0 +1,10 @@
+VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION
+--------------------------------------
+
+Visual Studio Windows Target Platform Minimum Version
+
+For Windows 10. Specifies the minimum version of the OS that is being
+targeted. For example ``10.0.10240.0``. If the value is not specified, the
+value of :variable:`CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION` will be used on
+WindowsStore projects otherwise the target platform minimum version will not
+be specified for the project.