Use v0.7.3 of LSP packages.
Use v0.7.3 of LSP packages.

Fixes a bug (OmniSharp/csharp-language-server-protocol#60 / OmniSharp/csharp-language-server-protocol#62) where language server failed to terminate when VS Code sent it a shutdown request.

tintoy/msbuild-project-tools-vscode,tintoy/msbuild-project-tools-vscode