Add EmptyReload InfoType for digital display

[NukeAtty]

Adds a new InfoType=EmptyReload for digital display.

• New DisplayInfoType::EmptyReload enumeration value (appended as 21 to preserve save-game compatibility).
• New INI tag parsing for InfoType=EmptyReload.
• Displays the empty reload countdown while the Techno has no ammo left, and 0 otherwise.
• Falls back to Reload duration when EmptyReload is not positive.
• Existing InfoType=Reload behavior is unchanged.

[github-actions]

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[DeathFishAtEase]

I suggest that after LLM helps complete the PR, human developers should review it independently first before opening the pull request.

[Coronia]

would it be better if this just use Reload infotype and handle EmptyReload specifically? Not sure if there's any case that only need to show EmptyReload seperatedly

[NukeAtty]

would it be better if this just use Reload infotype and handle EmptyReload specifically? Not sure if there's any case that only need to show EmptyReload seperatedly

Oh I see, silly of me, now this PR is kinda meaningless. I'd close it now :)

[NukeAtty]

Closing: EmptyReload behavior is already covered by the existing Reload InfoType.