Separate dialect for IPython is created to redefine parser and lexer in Jupyter cells. Dollar sign added to console
symbols since it can be used in shell commands. Additional cell type for cell magic introduced.

The extension makes possible to selectively disable 'Statement has no effect' concerns.

Style management lifted to JavaFxHtmlPanel.

Changes necessary to provide new scientific notebooks support with separated source code editor and output preview.

IPython specific syntax is captured by console parser, including:
* Multiline magic
* Exclamation in suffixes
* Double exclamation
* Help syntax

Test classes for console moved to separate package.
PY-32597 Tests for regular Python in console added

PyConsoleParser code simplified.

IPython specific syntax is captured by console parser, including:
* Multiline magic
* Exclamation in suffixes
* Double exclamation
* Help syntax

Test classes for console moved to separate package.

IDEA-184388: Exception on pressing "context menu button" if there is no context menu in the current UI component