Remove Java dependency for Encryption Key Request

Encryption Key Request is now fully processed using .NET RSA
capabilities
-> Good news, that was the last step for removing IKVM dependencies!
-> So now MCC does not need to use any external library. Yay! :)
-> MCC should now be compatible with Mono (Mac, Linux).
+ Removed no longed needed DLL files (9 MBytes!)
+ State MC 1.7.5 as a supported version.
+ Update version number to MCC 1.7.2

MinecraftClient/MinecraftClient.csproj

@@ -60,18 +60,6 @@
   </PropertyGroup>
   <PropertyGroup />
   <ItemGroup>
-    <Reference Include="IKVM.OpenJDK.Core, Version=7.0.4335.0, Culture=neutral, PublicKeyToken=13235d27fcbfff58, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>.\IKVM.OpenJDK.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="IKVM.OpenJDK.Security, Version=7.0.4335.0, Culture=neutral, PublicKeyToken=13235d27fcbfff58, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>.\IKVM.OpenJDK.Security.dll</HintPath>
-    </Reference>
-    <Reference Include="IKVM.OpenJDK.Util, Version=7.0.4335.0, Culture=neutral, PublicKeyToken=13235d27fcbfff58, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>.\IKVM.OpenJDK.Util.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Windows.Forms" />
@@ -116,10 +104,6 @@
   </ItemGroup>
   <ItemGroup>
     <Content Include="resources\appicon.ico" />
-    <Content Include="lib\IKVM.OpenJDK.Core.dll" />
-    <Content Include="lib\IKVM.OpenJDK.Security.dll" />
-    <Content Include="lib\IKVM.OpenJDK.Util.dll" />
-    <Content Include="lib\IKVM.Runtime.dll" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.