* add theme support of diagram
* add init mermaidTheme and vegaTheme when init muya
* export diagram
* update changelog
* add delete icon
* replace table toolbar icon to png
* replace icons in fromt menu and quick insert
* update format icons to png
* add theme support of diagram
* add init mermaidTheme and vegaTheme when init muya
* export diagram
* update changelog
* add delete icon
* replace table toolbar icon to png
* replace icons in fromt menu and quick insert
* update format icons to png
* update front icon hover color
* adjust format box icon size
* prevent some warning and rerender after change from source code
* remove debug code and replace image icon
* feat: add front menu
* update changelog
* feat: add short cut of paragraph edit
* fix location bug of submenu
* update checkbox style in editor
* update selected background color
* update KEYBINDINGS.md
* Bullet to ordered list issue:
* emit change event after control paragraph
* fix: marked parse error
* disable table, front-matter and horizontal line in paragraph turn into, and fixed paragraph turn into html and math
* fix unwanted space before text paragraph when heading turn into text paragraph
* fix error when turn heading to paragraph
* put front menu on the left on front icon
* update readme
* if the selection span in two lnes, disable paragraph turn into heading
* some style in editor changed
* opti: the display of header
* fix Cursor disappear when use arrow down/up switch between headers #867
* add a add_close svg icon
* support ruby and better raw html display
* finish ruby render
* add kbd style
* if content is empty string, do not hide tag
* update changelog
* add auto complement to inline html
* opti slit words
* opti tool bar style
* support open inline a tag if it is a external link
* fix: auto complete
* add attribute white list
* add comment
* delete some commented codes
