Windows/MSVC build scripts: support for VS 2017 CMake generators, update Boost to 1.63.0, update ICU download to 58.2 in order to have VS 2107 download available, configure Boost using generic MSVC instead of specific version, make sure to 'git fetch' before 'git checkout <revision>'.

win/vs-cfg.cmd

@@ -43,7 +43,11 @@ set GENERATORS[6]="Visual Studio 12 2013 Win64"
 set GENERATORS[7]="Visual Studio 12 2013"
 set GENERATORS[8]="Visual Studio 14 2015 Win64"
 set GENERATORS[9]="Visual Studio 14 2015"
-set LAST_GENERATOR_IDX=9
+:: NOTE VC version for VS 2017 is not 15 but 14.1: have to wait and see
+:: if CMake generator string is updated to reflect this.
+set GENERATORS[10]="Visual Studio 15 2017 Win64"
+set GENERATORS[11]="Visual Studio 15 2017"
+set LAST_GENERATOR_IDX=11
 
 set STEP=2
 :: Is generator shorthand used?
@@ -67,7 +71,8 @@ echo(!GENERATOR! | findstr /c:"vs20" >nul && (
 
 :: Deduce desired architecture from the location of cl.exe
 :: TODO harmless "INFO: Could not find files for the given pattern(s)." spam if cl.exe not in path
-where cl.exe | findstr /c:"amd64" >nul
+:: Look for path with either "amd64" or "x64" (VS 2017 and newer)
+where cl.exe | findstr "amd64 x64" >nul
 set START=%ERRORLEVEL%
 
 IF "!GENERATOR!"=="" IF NOT "%VisualStudioVersion%"=="" (
@@ -108,7 +113,7 @@ set TARGET_ARCH=x86
 :: Visual Studio platform name, Win32 (i.e. x86) or x64.
 set VS_PLATFORM=Win32
 
-:: Find out VS version, VC versions and are we doing 64-bit or not.
+:: Find out VS (e.g. 2015) and VC (e.g. 14) versions and are we targeting x64 or not (x86).
 :: VS_VER and VC_VER are convenience variables used f.ex. for filenames.
 set GENERATOR_NO_DOUBLEQUOTES=%GENERATOR:"=%
 set GENERATOR_SPLIT=%GENERATOR_NO_DOUBLEQUOTES: =,%