Better exception support in VSCode 1.10.0

[Gama11]

@nulld We can probably make use of this new API once it's released?

• Improve exception experience microsoft/vscode#16860
• Debug Protocol: Support for getting information about a thrown exception microsoft/vscode-debugadapter-node#97

[MSGhero]

I'm unfamiliar with how this lib works, but would this let you cancel a launch if the build fails? I.e. now using master and debug (Flash + rebuild), my SWF still launches even if there was a compiler error. It launches the existing version rather than not launching anything. It's a bit misleading because it seems like the compile worked and I'm running the new version.