azure: upgrade to newer Windows VM images

This is a subset of commit 95f329b4 (azure: upgrade to newer hosted VM
images, 2020-03-10), upgrading all of our Windows jobs to use
'vs2017-win2016' machines and macOS to 'macos-10.14'. This is intended
to keep our continuous integration builds from failing in the future, as
these images will get deprecated on March 31st. As this is in
preparation of a stable release, we do not want to upgrade any of the
other machines like is done in the mentioned commit but keep the impact
minimal.

fixup! azure: upgrade to newer Windows VM images

azure-pipelines.yml

@@ -61,7 +61,7 @@ jobs:
 - job: macos
   displayName: 'macOS'
   pool:
-    vmImage: 'macOS 10.13'
+    vmImage: 'macOS-10.14'
   steps:
   - bash: . '$(Build.SourcesDirectory)/ci/setup-osx.sh'
     displayName: Setup
@@ -76,25 +76,28 @@ jobs:
 
 - job: windows_vs_amd64
   displayName: 'Windows (amd64; Visual Studio)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - template: azure-pipelines/powershell.yml
     parameters:
       environmentVariables:
-        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 12 2013 Win64" -DDEPRECATE_HARD=ON
+        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 15 2017" -A x64 -DDEPRECATE_HARD=ON
 
 - job: windows_vs_x86
   displayName: 'Windows (x86; Visual Studio)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - template: azure-pipelines/powershell.yml
     parameters:
       environmentVariables:
-        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 12 2013" -DDEPRECATE_HARD=ON
+        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 15 2017" -A Win32 -DDEPRECATE_HARD=ON
 
 - job: windows_mingw_amd64
   displayName: 'Windows (amd64; MinGW)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - powershell: . '$(Build.SourcesDirectory)\ci\setup-mingw.ps1'
     displayName: Setup
@@ -109,7 +112,8 @@ jobs:
 
 - job: windows_mingw_x86
   displayName: 'Windows (x86; MinGW)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - powershell: . '$(Build.SourcesDirectory)\ci\setup-mingw.ps1'
     displayName: Setup

azure-pipelines/nightly.yml

@@ -61,7 +61,7 @@ jobs:
 - job: macos
   displayName: 'macOS'
   pool:
-    vmImage: 'macOS 10.13'
+    vmImage: 'macOS-10.14'
   steps:
   - bash: . '$(Build.SourcesDirectory)/ci/setup-osx.sh'
     displayName: Setup
@@ -77,27 +77,30 @@ jobs:
 
 - job: windows_vs_amd64
   displayName: 'Windows (amd64; Visual Studio)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - template: powershell.yml
     parameters:
       environmentVariables:
-        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 12 2013 Win64" -DDEPRECATE_HARD=ON
+        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 15 2017" -A x64 -DDEPRECATE_HARD=ON
         RUN_INVASIVE_TESTS: true
 
 - job: windows_vs_x86
   displayName: 'Windows (x86; Visual Studio)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - template: powershell.yml
     parameters:
       environmentVariables:
-        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 12 2013" -DDEPRECATE_HARD=ON
+        CMAKE_OPTIONS: -DMSVC_CRTDBG=ON -G"Visual Studio 15 2017" -A Win32 -DDEPRECATE_HARD=ON
         RUN_INVASIVE_TESTS: true
 
 - job: windows_mingw_amd64
   displayName: 'Windows (amd64; MinGW)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - powershell: . '$(Build.SourcesDirectory)\ci\setup-mingw.ps1'
     displayName: Setup
@@ -113,7 +116,8 @@ jobs:
 
 - job: windows_mingw_x86
   displayName: 'Windows (x86; MinGW)'
-  pool: Hosted
+  pool:
+    vmImage: 'vs2017-win2016'
   steps:
   - powershell: . '$(Build.SourcesDirectory)\ci\setup-mingw.ps1'
     displayName: Setup