render the timeline in the markdown
```timeline
2023-1-1
build project
build folder
2023-2-2
develop map generate and basic AI
2023-2-3
test map
2023-2-7
test map
2023-2-8
test map
2023-2-9
test map
```
The block start with ```timeline,end with ```
Every node is composed of time and content and is split by space line between different node.
open the menu above Tools->Options->Timeline
Hieu-Thi Luong's Life Calendar plugin,I refer to his code.
乔珂力的css时间轴教程
Joplin's offical tutorial.
ChatGPT 4o
GPL
- fix the error of time in different country
- add the change style chapter to readme.md
- fixed the problem of time reduction by one day in some countries
- add time config menu
- recover markdown function