0028701: Configuration - add support of VS 2017

Added support of Visual Studio 2017 (15) in CMake build procedure.
CMake 3.7.2 or above is required to generate projects for VS 2017.

Since version of compiler and toolset remained at 14 (now they are 14.1), and they use the same run-time, the same third-party products as for VS 2015 (14) can be used.
Also the name of the folder for installation of OCCT binaries in OCCT-standard layout (default on Windows) remains "vc14".

Support of Visual Studio 2017 is added in genproj generator and relevant environment, with format specifier "vc141".

The syntax of the genproj command is revised:
- UWP is considered as separate platform ("uwp" alternative to "wnt"), not part of IDE specification
- Option "IDE" is renamed to "Format"
- Obsolete name of local variable "aWokStation" is replaced by equivalent "theFormat"

In environment scripts, additional variables are defined (derived from VCVER, see adm/vcver.bat):
- VCLIB defines name of the subdirectory specific to VS version; it is the same as VCVER except that for VCVER=vc141 VCLIB=vc14 and for VCVER=141-uwp VCLIB=vc14-uwp
- VCFMT is VCVER without optional suffix "-uwp"
- VCPROP is "NativeDesktop" for normal builds or "Universal" for UWP builds

Command genconf is amended to:
- Detect presence of VS 2017 (separately for desktop and UWP)
- Use only two first digits after "vc" in format specification for search of third-party libs
- Have more space in user interface for VS specification

All supported variants of VCVER variable are documented in dev guides / buiding / msvc

dox/dev_guides/building/msvc.md

@@ -26,7 +26,18 @@ You can also build third-party libraries from their sources, see @ref occt_dev_g
 
 If you have Visual Studio projects already available (pre-installed or generated), you can edit file *custom.bat* manually to adjust the environment:
 
-* *VCVER* -- version of Visual Studio (vc10, vc11, vc12, or vc14), and relevant *VCVARS* path
+* *VCVER* -- specification of format of project files, defining also version of Visual Studio to be used, and default name of the sub-folder for binaries:
+
+| VCVER     | Visual Studio version | Windows Platform                 | Binaries folder name |
+|-----------|-----------------------|----------------------------------|----------------------|
+| vc10      | 2010 (10)             | Desktop (Windows API)            | vc10 |
+| vc11      | 2012 (11)             | Desktop (Windows API)            | vc11 |
+| vc12      | 2013 (12)             | Desktop (Windows API)            | vc12 |
+| vc14      | 2015 (14)             | Desktop (Windows API)            | vc14 |
+| vc14-uwp  | 2015 (14)             | UWP (Universal Windows Platform) | vc14-uwp |
+| vc141     | 2017 (15)             | Desktop (Windows API)            | vc14 |
+| vc141-uwp | 2017 (15)             | UWP (Universal Windows Platform) | vc14-uwp |
+
 * *ARCH* -- architecture (32 or 64), affects only *PATH* variable for execution
 * <i>HAVE_*</i> -- flags to enable or disable use of optional third-party products
 * <i>CSF_OPT_*</i> -- paths to search for includes and binaries of all used  third-party products