Add debug config property "clientOS" to replace "WindowsClient" / "Un…

…ixClient" in "debugOptions".

Remove helper scripts for the old signed build pipeline.

Do not install tox into tox

Having tox as a dependency in requirements files means that
it's also installed in all the tox environments.

Fix versioneer not updating _version.py.

Consider files in pip-global to be library files. Fixes microsoft#664

Fix issue with step into target with `LOAD_METHOD`. Fixes microsoft#661

Improvements to step into target. Work in progress: microsoft#576

Description:
- Changes the structure to create a stack from the bytecode information
  so that function call names are correctly computed (this is still a work
  in progress as not all bytecode instructions are currently supported).
- Support to step into function calls inside comprehensions/generators.
- Updates the bytecode dependency to 0.12.0.
  Note: changes were done to the bytecode library to keep the bytecode offset.

Provide full string when evaluating clipboard. Fixes microsoft#110

Fix microsoft#463: Enable overriding "pythonPath" in the launcher

Add "debugLauncherPython" debug config property to customize Python interpreter used to spawn the launcher.

Fix pydevd_attach_to_process Windows build script to locate VC++ usin…

…g vswhere.

Update pydevd_attach_to_process binaries.