v0.0.4

1. #9 : now the color highlighting will be active when opening a text document.
2. #8: add a 50ms debounce to the updating of color highlighting.
3. #5: enable CTRL+ALT+F without a text selection.
4. #1: now only highlight titles of effective foldable blocks.
5. #5: now the command will add the end tag in a new line when the last line of the text selection endswith an existing foldable block end tag.
6. #2: now highlighting use the foreground color of the active theme as the background color and the background color of the active theme as the text color.