The call to Dns.GetHostEntry() may fail on MacOS (#1927)

* The call to Dns.GetHostEntry() may fail on MacOS

... only ever seen there.

* Build on one CPU only

Maybe this avoids the concurrency problems?

* Revert "Build on one CPU only"

This reverts commit 7ee8124.

* Make sure there's only one .csproj per directory

Therefore split up sample folders containing multiple
projects into subfolders. This fixes the macOS build and
also some weird issues on other operating systems (such
as the debugger getting confused about which one to execute)

* Also update the solution files

Author: pgrawehr

src/devices/Arduino/Arduino.sln

@@ -7,7 +7,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Arduino", "Arduino.csproj",
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Device.Gpio", "..\..\System.Device.Gpio\System.Device.Gpio.csproj", "{0B90F9D4-7353-4172-A317-714471A06781}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Arduino.sample", "samples\Arduino.sample.csproj", "{2670F7BF-A7C8-49EB-9A99-1719A90D0C67}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Arduino.sample", "samples\ApiChecker\Arduino.sample.csproj", "{2670F7BF-A7C8-49EB-9A99-1719A90D0C67}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Bmxx80", "..\Bmxx80\Bmxx80.csproj", "{EEEB0FB8-E1ED-4970-BDF6-DA3D5E2ED074}"
 EndProject
@@ -21,7 +21,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CpuTemperature", "..\CpuTem
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "samples", "samples", "{9E5A25ED-9839-4C1A-9B27-993437D1CB31}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Arduino.Monitor", "samples\Arduino.Monitor.csproj", "{23B4B60C-9594-42BB-9D25-C54983B0F809}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Arduino.Monitor", "samples\Monitor\Arduino.Monitor.csproj", "{23B4B60C-9594-42BB-9D25-C54983B0F809}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{CA26B999-4C0E-4E82-A46E-A68AC1B85C10}"
 EndProject

src/devices/Arduino/samples/Arduino.sample.cs renamed to src/devices/Arduino/samples/ApiChecker/Arduino.sample.cs

@@ -16,10 +16,9 @@
     <Compile Include="TestCases.cs" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\Bmxx80\Bmxx80.csproj" />
-    <ProjectReference Include="..\..\Board\Board.csproj" />
-    <ProjectReference Include="..\..\Common\Common.csproj" />
-    <ProjectReference Include="..\..\Mcp3xxx\Mcp3xxx.csproj" />
-    <ProjectReference Include="..\Arduino.csproj" />
+    <ProjectReference Include="..\..\..\Bmxx80\Bmxx80.csproj" />
+    <ProjectReference Include="..\..\..\Board\Board.csproj" />
+    <ProjectReference Include="..\..\..\Mcp3xxx\Mcp3xxx.csproj" />
+    <ProjectReference Include="..\..\Arduino.csproj" />
   </ItemGroup>
 </Project>

src/devices/Arduino/samples/Arduino.sample.csproj renamed to src/devices/Arduino/samples/ApiChecker/Arduino.sample.csproj

@@ -14,13 +14,12 @@
     <Compile Include="Arduino.Monitor.cs" />
   </ItemGroup>
   <ItemGroup>
-    <!--Cases used when running in VS, with the solution config either Windows-Debug or Linux-Debug (or -Release) -->
-    <ProjectReference Include="..\..\Bmxx80\Bmxx80.csproj" />
-    <ProjectReference Include="..\..\Button\Button.csproj" />
-    <ProjectReference Include="..\..\Board\Board.csproj" />
-    <ProjectReference Include="..\..\CharacterLcd\CharacterLcd.csproj" />
-    <ProjectReference Include="..\..\HardwareMonitor\HardwareMonitor.csproj" />
-    <ProjectReference Include="..\..\Mcp3xxx\Mcp3xxx.csproj" />
-    <ProjectReference Include="..\Arduino.csproj" />
+    <ProjectReference Include="..\..\..\Bmxx80\Bmxx80.csproj" />
+    <ProjectReference Include="..\..\..\Button\Button.csproj" />
+    <ProjectReference Include="..\..\..\Board\Board.csproj" />
+    <ProjectReference Include="..\..\..\CharacterLcd\CharacterLcd.csproj" />
+    <ProjectReference Include="..\..\..\HardwareMonitor\HardwareMonitor.csproj" />
+    <ProjectReference Include="..\..\..\Mcp3xxx\Mcp3xxx.csproj" />
+    <ProjectReference Include="..\..\Arduino.csproj" />
   </ItemGroup>
 </Project>