feat: Add trigger of the left click and optimize the code logic

[jinzhongjia]

• add left click support
• separate code to make logic clearer
• modify the sparator triggering logic（with unions enum） and no longer use "-"
• examples are more detailed
• add step to generate docs
• event loop with block and non-block
• update readme

[jinzhongjia]

Please don't merge this PR yet, I still have some work to do.

• [x] Write API documentation

Now, everything is ok!

[jinzhongjia]

After this work is completed I will try to add linux support

[jinzhongjia]

add block and non-block mode, block-time is waiting time for nanoseconds

[jinzhongjia]

We cannot keep using PeekMessageA to retrieve whether there are messages, because this will cause high CPU usage. On this basis, a short sleep will effectively solve the problem.

Another better solution is to use blocking api, which is getMessageA

[star-tek-mb]

Hello! Thank you for your work! Please let me know, if you want merge.

[jinzhongjia]

I think the PR is ready to be merged

However, the behavior of the init function is slightly different from that of the init function in the zig standard library (in the standard library it will return a specific value of a certain type for initialization). I will try to see if I can make it more idiomatic.

[jinzhongjia]

However, for the init work, I plan to open another PR later. The current PR has made enough changes.

[star-tek-mb]

Looks good to me. But i think we need to change variable name in ConstMenu. Change enum text to content with fields text and separator. And also we should definitely change init function to return instance of Tray. We also need to specify default values for init function. For example nulls on event handlers for click, and default block time.

I will look into it in the weekends. Or I can wait for your PR if you want to do some coding.