v0.9: Add Changelog. (#213)

The first version with a Changelog;

screen

• Style:
  • Bold.
  • Blink.
  • Dim.
  • Inverted.
  • Underlined.
  • Foreground color.
  • Background color.
• Support for UTF8 unicode.
  • Full wide character: 测试.
  • Combining characters: a⃒
• A Stencil buffer.
• Automatically merge box drawing characters.
• Detect terminal dimension.

DOM

• Element:

  • text & vtext
  • separator and 5 variations.
  • gauge
  • border and 6 variations.
  • window
  • spinner
  • paragraph and hflow.

• Layout:

  • hbox
  • vbox
  • dbox
  • gridbox
  • frame: Drawing inside a virtual area, potentially larger than the real
    one.
  • focus, select: scroll the inner view of a frame, to be in view.
  • flex & 8 variations. filler

• Decorators:

  • bold
  • dim
  • inverted
  • blink
  • color
  • bgcolor
  • clearunder

Component

• Container:
  • Container::Vertical
  • Container::Horizontal
  • Container::Tab
• Button
• Checkbox
• Input
• Menu
• MenuEntry
• Radiobox
• Toggle
• Slider
• Renderer & variations
• CatchEvent

MISC

• Fuzzer
• Tests using gtest.
• Doxygen documentation
• IWYU
• 52 examples.
• Support for WebAssembly.
• Support for Window and fallback for broken terminal.