Combined existing code to create LOS limited damage numbers for clients

[oskrtg]

Summary

Implement server-controlled gameplay damage number display with client-side placement customization and LOS gating.

Changes

New Server Settings

• bShowDamageNumbers — Enables gameplay damage numbers (LOS-gated)
• bEnableDamageDebugMode — Shows numbers regardless of LOS
• bEnableDamageDebugConsoleMessages — Logs debug info to console
• DamageNumberDuration, DamageNumberDecayExponent, DamageNumberAccumulationTime — Timing and fade curve tuning
• DamageNumberDrawOffset — Server default horizontal position for damage numbers; overridable by client preference

New Client Setting

• DamageNumberTextLocationX/Y — Client-side placement override; -1.0 sentinel falls back to server default

LOS Enforcement

• Extracted DoVisibilityTrace() in IGPlus_HitFeedback for reuse across damage event processing
• Gameplay numbers always LOS-gated; debug mode bypasses it
• LOS failure signalled by negating Sw in ReceiveLocalizedMessage; Abs(Sw) used for actual damage magnitude

Rendering

• DrawDamageNumbers in bbPlayerStatics reads client settings; uses client X/Y if set, otherwise server offset
• Gate changed from bEnableDamageDebugMode to bShowDamageNumbers || bEnableDamageDebugMode

UI & Documentation

• Server settings dialog: added all new server controls
• Client settings dialog: added damage numbers section with screen location control
• README updated with all new settings and behavior