Fix assembly version after converting projects to SDK style

SDK style projects set the assembly version to 1.0.0.0 by
default. Classic projects use 0.0.0.0 as the assembly version.
Setting the version to 0.0.0.0 to avoid compatibility warnings.

Author: mrward

Mono.Debugger.Soft/Mono.Debugger.Soft.csproj

@@ -10,6 +10,7 @@
     <DebugType>embedded</DebugType>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>False</ConsolePause>
+    <AssemblyVersion>0.0.0.0</AssemblyVersion>
   </PropertyGroup>
 
   <Import Project="..\Mono.Debugging.settings" />

Mono.Debugging.Soft/Mono.Debugging.Soft.csproj

@@ -8,6 +8,7 @@
     <DocumentationFile>bin\$(Configuration)\Mono.Debugging.Soft.xml</DocumentationFile>
     <DebugSymbols>True</DebugSymbols>
     <DebugType>embedded</DebugType>
+    <AssemblyVersion>0.0.0.0</AssemblyVersion>
   </PropertyGroup>
 
   <Import Project="..\Mono.Debugging.settings" />

Mono.Debugging/Mono.Debugging.csproj

@@ -11,6 +11,7 @@
     <DocumentationFile>bin\$(Configuration)\Mono.Debugging.xml</DocumentationFile>
     <DebugSymbols>True</DebugSymbols>
     <DebugType>embedded</DebugType>
+    <AssemblyVersion>0.0.0.0</AssemblyVersion>
   </PropertyGroup>
 
   <Import Project="..\Mono.Debugging.settings" />