crash fixes of tiberium spread & grow in long games and a new tag

[FS-21]

What kind of change is this?

• New feature, vanilla bugfix or enhancement of a released feature - changelog, docs and credits entries are needed.
• Improvement to a new (unreleased) feature - docs and credits entries are needed; no changelog entry (Skip Changelog).
• Bugfix to a new (unreleased) feature - credits entry is needed; no changelog or docs entries (Skip Changelog, Skip Docs).
• Bugfix to an old (released) feature - changelog and credits entries are needed; no docs entry (Skip Docs).
• Completely minor change (e.g. a typo fix) - no entries are needed (Skip Changelog, Skip Docs, Skip Credits).

Description (all the technical explanation of the problems & vanilla crashes is done with AI, I already made tests and the crashes when the tiberium spreaded a lot in the map is gone, finally).

This PR fixes two longstanding vanilla engine issues with Tiberium growth/spread queues, and introduces an opt-in flag to allow resources to expand onto slopes/ramps.

1. Long-game Heap Overflow Crash (0x005657A5 / 0x00723005)

• In matches with active Tiberium spread on large maps, GrowthLogic and SpreadLogic eventually overflow their preallocated PriorityQueueClassNode buffers (PriorityQueueClassNode::SurfaceDataCount()), corrupting heap headers and crashing the game.
• Added capacity safety checks and proactive queue re-indexing before buffer boundaries are breached (0x7235CE, 0x722B48, 0x722586, 0x72302E).

2. Tiberium Growth / Spread Queue Stall

• When a queued cell fails to spread/grow (e.g. due to temporary blocking or invalid neighbor tiles), Westwood popped the cell from the priority queue but forgot to reset CellIndexesWithTiberium[surfaceIdx] = false.
• This permanently marked the cell as "already queued", preventing subsequent passes and eventually freezing resource expansion map-wide. Properly cleared at 0x722574.

3. Ramp Expansion Support (AllowRamps)

• In vanilla, several hardcoded checks actively prevented Tiberium on slopes:
  • CellClass::RecalcAttributes (0x0047D36E) forcibly wiped OverlayTypeIndex = -1 and OverlayData = 0 whenever SlopeIndex != 0.
  • CellClass::Can_Tiberium_Germinate checked IsometricTileTypeClass->AllowTiberium, which is false for ramp tiles across all theater INIs.
  • Slope checks in Can_Tiberium_Grow, Can_Tiberium_Spread, Spread_Tiberium, and Increase_Tiberium rejected slope indices.
  • Draw_Overlay and GetContainingRect could divide by zero when slope overlays were rendered without initialized slope counts.
• AllowRamps=yes under individual Tiberium sections allows cardinal ramps (slopes 1..4) to germinate, grow through stages, and spread naturally to/from ramp cells, setting NumSlopes = 8 and adding division-by-zero guards.

In rulesmd.ini:

[SOMEORE]        ; Tiberium
AllowRamps=false ; boolean

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