2.0.22: Latest Cecil, debug info and Unix support (both .NET and Mono)

• https://www.nuget.org/packages/ILRepack/2.0.22
• https://www.nuget.org/packages/ILRepack.Lib/2.0.22

What's Changed

• Update Cecil submodule to latest by @KirillOsenkov in #333

Full Changelog: 2.0.20...2.0.22

• Updated to the very latest Mono.Cecil
• Support for legacy, portable and embedded PDBs
• Debug info support, sequence points, scopes, locals, custom debug info
• Unix support now working, either via dotnet ILRepack.exe or mono ILRepack.exe
• Removed Mono.Posix dependency, shelling out to stat and chmod to set permissions
• shipping ILRepack.runtimeconfig.json in the NuGet package so that dotnet ILRepack.exe works
• repacking .NET Core WinForms resources now works (fixed #277)
• resolving assemblies from .NET Core runtime
• writing to a temp directory first, allows repacking the primary assembly in-place
• deleted gradle from the build system, using plain MSBuild now
• less output without /verbose argument
• misc bug fixes