Make Vocaluxe buildable and playable on GNU/Linux

Build with MonoDevelop or make.
Summary of the biggest changes:

* Correct for case differences between System.Data.SQLite and
  Mono.Data.Sqlite
* Exclude Direct3D and DirectSound from linux builds
* Provide linux versions of some windows-specific build events
* Exclude VocaluxeTests from linux builds so xbuild will work
* Add ability to build the native PitchTracker on linux
* Fix some problems with acinerella module
* Fix some windows-specific dependency checks that fail on linux
* Set OpenGL color format to 24-bit on linux

VocaluxeLib/VocaluxeLib.csproj

@@ -12,6 +12,8 @@
     <AssemblyName>VocaluxeLib</AssemblyName>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
     <TargetFrameworkProfile>Client</TargetFrameworkProfile>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'DebugWin|AnyCPU'">
@@ -112,7 +114,7 @@
     <Compile Include="XmlStructs.cs" />
     <Compile Include="Xml\CTypeExtensions.cs" />
     <Compile Include="Xml\CXmlDeserializer.cs" />
-    <Compile Include="Xml\CXmlReader.cs" />
+    <Compile Include="Xml\CXMLReader.cs" />
     <Compile Include="Xml\CXmlReaderBase.cs" />
     <Compile Include="Xml\CXmlSerializer.cs" />
     <Compile Include="Enums.cs" />