Added core functionality to support interactive input.
Refactored core support for interactive input.
Almost finished core support for interactive input (need data verification and input in non-server mode).
Added support for image point input in browser client code.
Added interactive phase portrait example.
Added new interactive input boxes (inplemented only signal). Fixed bugs in PoinInputBox. Added clear port to CanvasBox and flush port to DumpBox.
Solved workflow recursion problem that can naturally appear in externally activated async input boxes.
Almost implemented simple and range input boxes, refactored point input.
Finished basic interactive input. Added more examples.