canvas_danmaku

• Fix opacity change.

• Support danmaku font family option.

• Support danaku stroke weight option.
• Support line height option.
• Optimize danmaku drawing performance.

• Support bilibili spicial danmaku && better danmaku stopwatch.

• Power Saving.

• Danmakus can be cleared even they are not running.

• Add safe area option.

• Add customize font weight support.

• Better danamku cleaner.

• Fix flick when danmaku speed was changed.

• Add rect to your own danmaku.

• Fix danmaku area option.

• When the updateOption() function is called to hide a specified type of danmaku, this type of danmaku will be cleared immediately.

• Bug fix (resume danmaku when danmaku is running leads to stopwatch error)

• Pass static analysis

• fix Layout

• add IgnorePointer

• stopResume improve

• Bug fix

• Bug fix

• Fix overflow

• Add massive mode

Fixed problem that animation cannot continue after sleeping on androi…

• Fixed problem that animation cannot continue after sleeping on android/ios platform

• Improved collision detection

• Add option for hide danmaku

• Better performance

• Add dartdoc comments

• Support topDanmaku and bottomDanmaku

• Pass static analysis

• Initial release.