New Legacy Windows renderer

This release drops Colorama as a dependancy in favour of an internal Win32 render.

There are some new features for progress bars, added support for pretty printing named tuples, and a bunch of fixes.

As a major version there are a few breaking changes, see below.

[12.0.0] - 2022-03-10

Added

• Added options to TimeRemainingColumn to render a compact time format and render elapsed time when a task is
  finished. #1992
• Added ProgressColumn MofNCompleteColumn to display raw completed/total column (similar to DownloadColumn,
  but displays values as ints, does not convert to floats or add bit/bytes units).
  #1941
• Replace Colorama with win32 renderer #1993
• Add support for namedtuples to Pretty #2031

Fixed

• In Jupyter mode make the link target be set to "_blank"
• Fix some issues with markup handling around "[" characters https://github.com//pull/1950
• Fix syntax lexer guessing.
• Fixed Pretty measure not respecting expand_all #1998
• Collapsed definitions for single-character spinners, to save memory and reduce import time.
• Fix print_json indent type in __init__.py
• Fix error when inspecting object defined in REPL #2037
• Fix incorrect highlighting of non-indented JSON #2038
• Fixed height reset in complex renderables #2042

Changed

• Improved support for enum.Flag in ReprHighlighter #1920
• Tree now respects justify=None, i.e. won't pad to right #1690
• Removed rich.tabulate which was marked for deprecation
• Deprecated rich.align.AlignValues in favor of AlignMethod