cmake: Show in --help how to select VS target platform (#15422)

* Re-order VS generators from newest to oldest.

* Show how to specify a VS generator with a target platform

* Increase the option output indentation to avoid extra wrapping
  with longer generator names.

Source/cmDocumentationFormatter.cxx

@@ -204,7 +204,7 @@ void cmDocumentationFormatter
     if(!op->Name.empty())
       {
       os << "  " << op->Name;
-      this->TextIndent = "                                ";
+      this->TextIndent = "                                 ";
       int align = static_cast<int>(strlen(this->TextIndent))-4;
       for(int i = static_cast<int>(op->Name.size()); i < align; ++i)
         {

Source/cmGlobalVisualStudio10Generator.cxx

@@ -71,8 +71,11 @@ public:
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const
     {
-    entry.Name = vs10generatorName;
-    entry.Brief = "Generates Visual Studio 10 (VS 2010) project files.";
+    entry.Name = std::string(vs10generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2010 project files.  "
+      "Optional [arch] can be \"Win64\" or \"IA64\"."
+      ;
     }
 
   virtual void GetGenerators(std::vector<std::string>& names) const

Source/cmGlobalVisualStudio11Generator.cxx

@@ -78,8 +78,11 @@ public:
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const
     {
-    entry.Name = vs11generatorName;
-    entry.Brief = "Generates Visual Studio 11 (VS 2012) project files.";
+    entry.Name = std::string(vs11generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2012 project files.  "
+      "Optional [arch] can be \"Win64\" or \"ARM\"."
+      ;
     }
 
   virtual void GetGenerators(std::vector<std::string>& names) const

Source/cmGlobalVisualStudio12Generator.cxx

@@ -66,8 +66,11 @@ public:
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const
     {
-    entry.Name = vs12generatorName;
-    entry.Brief = "Generates Visual Studio 12 (VS 2013) project files.";
+    entry.Name = std::string(vs12generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2013 project files.  "
+      "Optional [arch] can be \"Win64\" or \"ARM\"."
+      ;
     }
 
   virtual void GetGenerators(std::vector<std::string>& names) const

Source/cmGlobalVisualStudio14Generator.cxx

@@ -66,8 +66,11 @@ public:
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const
     {
-    entry.Name = vs14generatorName;
-    entry.Brief = "Generates Visual Studio 14 (VS 2015) project files.";
+    entry.Name = std::string(vs14generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2015 project files.  "
+      "Optional [arch] can be \"Win64\" or \"ARM\"."
+      ;
     }
 
   virtual void GetGenerators(std::vector<std::string>& names) const

Source/cmGlobalVisualStudio8Generator.cxx

@@ -66,8 +66,11 @@ public:
   }
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const {
-    entry.Name = vs8generatorName;
-    entry.Brief = "Generates Visual Studio 8 2005 project files.";
+    entry.Name = std::string(vs8generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2005 project files.  "
+      "Optional [arch] can be \"Win64\"."
+      ;
   }
 
   virtual void GetGenerators(std::vector<std::string>& names) const {

Source/cmGlobalVisualStudio9Generator.cxx

@@ -70,8 +70,11 @@ public:
   }
 
   virtual void GetDocumentation(cmDocumentationEntry& entry) const {
-    entry.Name = vs9generatorName;
-    entry.Brief = "Generates Visual Studio 9 2008 project files.";
+    entry.Name = std::string(vs9generatorName) + " [arch]";
+    entry.Brief =
+      "Generates Visual Studio 2008 project files.  "
+      "Optional [arch] can be \"Win64\" or \"IA64\"."
+      ;
   }
 
   virtual void GetGenerators(std::vector<std::string>& names) const {

Source/cmake.cxx

@@ -1817,23 +1817,23 @@ void cmake::AddDefaultGenerators()
 #if defined(_WIN32) && !defined(__CYGWIN__)
 # if !defined(CMAKE_BOOT_MINGW)
   this->Generators.push_back(
-    cmGlobalVisualStudio6Generator::NewFactory());
-  this->Generators.push_back(
-    cmGlobalVisualStudio7Generator::NewFactory());
+    cmGlobalVisualStudio14Generator::NewFactory());
   this->Generators.push_back(
-    cmGlobalVisualStudio10Generator::NewFactory());
+    cmGlobalVisualStudio12Generator::NewFactory());
   this->Generators.push_back(
     cmGlobalVisualStudio11Generator::NewFactory());
   this->Generators.push_back(
-    cmGlobalVisualStudio12Generator::NewFactory());
+    cmGlobalVisualStudio10Generator::NewFactory());
   this->Generators.push_back(
-    cmGlobalVisualStudio14Generator::NewFactory());
+    cmGlobalVisualStudio9Generator::NewFactory());
+  this->Generators.push_back(
+    cmGlobalVisualStudio8Generator::NewFactory());
   this->Generators.push_back(
     cmGlobalVisualStudio71Generator::NewFactory());
   this->Generators.push_back(
-    cmGlobalVisualStudio8Generator::NewFactory());
+    cmGlobalVisualStudio7Generator::NewFactory());
   this->Generators.push_back(
-    cmGlobalVisualStudio9Generator::NewFactory());
+    cmGlobalVisualStudio6Generator::NewFactory());
   this->Generators.push_back(
     cmGlobalBorlandMakefileGenerator::NewFactory());
   this->Generators.push_back(