* Adds launch request support for program args

* Combine types of function parameters
Co-authored-by: NPolina Sokolova <polinasok@users.noreply.github.com>

* Add no-op handlers for unsupported requests

* Fix whitespace

* Add couple of missing unsupported requests

* More comments

* Separate errors for unsupported and not-yet-implemented requests.

* Fix go.mod/sum dependencies
Co-authored-by: NPolina Sokolova <polinasok@users.noreply.github.com>

Embed the debugger config object in the service config object to avoid needless duplication of fields.

This flag allows users on UNIX systems to set the tty for the program
being debugged by Delve. This is useful for debugging command line
applications which need access to their own TTY, and also for
controlling the output of the debugged programs so that IDEs may open a
dedicated terminal to show the output for the process.

Co-authored-by: NPolina Sokolova <polinasok@users.noreply.github.com>

* Add support for threads request

* Address review comments

* Relax threads test condition

* Address review comments

* Clean up unnecessary newline

* Respond to review comment
Co-authored-by: NPolina Sokolova <polinasok@users.noreply.github.com>

* logflags: Add pid to server-listening-at message

* Address review comments: use logger
Co-authored-by: NPolina Sokolova <polinasok@users.noreply.github.com>

* service/dap: Add support for debug and test modes

* Address code review comments

* Remove //dap comment

* OptFlags() => optfalgs()

* If mode => switch mode

Using a stop channel to signal clean shutdown to the server's
goroutines. Also updates the tests to trigger disconnectChan.

This helps avoid spurious error logs when the client disconnects, when
Ctrl+C is pressed, etc.

* Panic guard for DAP request handling

* Use GetSeq

* Re-vendor new version of go-dap

* Remove comment

* Update error message

* Reuse er.Message in Format

- Move package doc comments so they are recognized as package doc.
- Use t.Helper when appropriate.

* Initial implementation for 'dlv dap'

* Fix Travis and AppVeyor failures

* Address review comments

* Address review comments

* Regenrate documentation

* Replace dap server printfs with log.Error

* Update 'dap log'

* Fix typos

* Revert logflags changes that got mixed in by accident