v1.23.0

Note: This release now requires the latest release of Mono 5.2.0 or later to build and run.

• Updated detection of Mono path to p/invoke into real_path in libc to properly resolve symlinks. (PR: #911)
• Fixed a Script project system regression introduced as part of #898, that caused CSX support to break for Desktop CLR scripts on Windows (PR: #913)
• Set DOTNET_UI_LANGUAGE environment variable while running dotnet --info to ensure that the output is not localized. (PR: #914)
• OmniSharp now targets net46 by default. (#666, PR: #915)
• Fixed typo in help output. (PR: #916)
• xUnit updated to latest 2.3.0 nightly beta, fixing running of xUnit tests inside VS 2017. (PR: #917)
• Fix solution parsing (again!) by introducing custom solution parsing API. (omnisharp-vscode#1645, PR: #918)
• Globally set various MSBuild properties to better support Mono-based projects. (#892, omnisharp-vscode#1597, omnisharp-vscode#1624, omnisharp-vscode#1396, PR: #923)
• Big changes to the build which improve build performance and move OmniSharp to Mono 5.2.0. (PR: #924)
• Update to Roslyn 2.3.0 packages. (PRs: #930, #931)