testium v0.4.2

• New Debug button on the run toolbar (Ctrl+Shift+D): enables the
  verbose debug output, immediately, and keeps its state.
• Right-click a py_func item to make it wait for your IDE debugger
  at the next run — no test file change, cleared on Refresh.
• New manual chapter "Debugging your tests": breakpoints, step-by-step,
  variables window, debug output, IDE attach.
• Error messages name the file, the item and the value in cause.
• An unresolved $(variable) or a failing <| ... |> evaluation
  prints a WARN naming it.
• Debug your py_func functions step by step: with debug: true on
  the item, the subprocess waits for your IDE debugger (debugpy) before
  running the function. Breakpoints, stepping and variable inspection
  work as usual.