Mono.Reflection disassemble IL

[bitfaster]

Use Mono.Cecil/Mono.Reflection to disassemble to IL.

Test outputs this:

	IL_0000: nop
	IL_0001: call System.Reflection.Assembly System.Reflection.Assembly::GetExecutingAssembly()
	IL_0006: stloc.0
	IL_0007: ldarg.0
	IL_0008: call System.Type System.Object::GetType()
	IL_000d: ldstr "Test"
	IL_0012: callvirt System.Reflection.MethodInfo System.Type::GetMethod(string)
	IL_0017: stloc.1
	IL_0018: ldloc.1
	IL_0019: call string JitExplorer.Engine.IL.Formatter::FormatMethodBody(System.Reflection.MethodBase)
	IL_001e: stloc.2
	IL_001f: ldarg.0
	IL_0020: ldfld Xunit.Abstractions.ITestOutputHelper JitExplorer.Engine.UnitTests.IL.DissassembleILTests::output
	IL_0025: ldloc.2
	IL_0026: callvirt void Xunit.Abstractions.ITestOutputHelper::WriteLine(string)
	IL_002b: nop
	IL_002c: ret