[Vanilla Enhancement] Task subtitles display in the middle of the screen

[CrimRecya]

• Now you can set MessageApplyHoverState to true，to make the upper left messages not disappear while mouse hovering over the top of display area.
• You can also let task subtitles to display directly in the middle area of the screen instead of the upper left corner, with a semi transparent background, by setting MessageDisplayInCenter to true.
  • When the mouse hovers over the subtitle area (simply judged as a rectangle), its opacity will increase and it will not disappear during this period.

In RA2MD.INI:

[Phobos]
MessageApplyHoverState=false  ; boolean
MessageDisplayInCenter=false  ; boolean

---

I'm not sure if there is a better implementation, but it's the simplest implementation that comes to my mind.

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[Metadorius]

Can we have an example image added to docs and to PR?

[CrimRecya]

• Is this image ok?

[CrimRecya]

TODO:

• impl:
  • Save and display historical message
• button:
  • Clear current message
  • Show/Hide current message
  • Show/Hide historical message

[TaranDahl]

I think you don't need to finish everything in one single pr🤔 Also, if you do so, it will result in a huge amount of review work, and as a result, no one will be willing to review😋

[CrimRecya]

So as TaranDahl said, I will use new PR to complete the to-do list afterwards.