feat: support cwd and env variable using sun jdi

[thunderz99]

An enhance for #39

Done

• cwd

  • Add "cwd" for LaunchConfiguration
    • default to ${projectRoot} if null or blank
  • Add a custom KDACommandLineLauncher which implements LaunchingConnector
    • The implementation is in original code written in Kotlin
  • Add unit test for cwd

• env variables

  • Add "envs" for LaunchConfiguration
  • Change "envs" config from List<String> to Map<String, String> style for more friendly user experience
  • Add unit test for envs

• support for jdk1.8

• support for jdk11

  • SunCommandLineLauncher cannot be extended under jdk11, so KDACommandLineLauncher implements LaunchingConnector directly
  • SocketTransportService cannot be constructed under jdk11, so it is newed by Class.forName

Linked pullreq

• Add cwd / envs support in vscode-kotlin https://github.com/fwcd/vscode-kotlin/pull/42

[bkleiner]

any update on this? what needs to be done to get this merged?

[thunderz99]

@fwcd Thank you for the advices, I will update this PR