Refactor projectile tracking to use lightweight array format

[fank]

Summary

• Replace hashmap with flat positional array for projectile data (indices 0-18)
• Remove JSON encoding overhead when sending to extension via :PROJECTILE: command
• Replace non-existent :TIMESTAMP: extension calls with diag_tickTime
• Rename variable from dataHash to projectileData

Motivation

The previous implementation used a hashmap with JSON encoding, which added unnecessary overhead for high-frequency fired events. This change:

• Reduces per-projectile data size (~500+ bytes → ~200-300 bytes)
• Eliminates CBA_fnc_encodeJSON call per projectile
• Fixes extension errors from missing :TIMESTAMP: handler
• Aligns with how other commands (:KILL:, :NEW:SOLDIER:STATE:, etc.) send data

Extension Interface Change

The :PROJECTILE: command now receives a flat array instead of JSON:

[firedFrame, firedTime, firerID, vehicleID, vehicleRole, remoteControllerID, 
 weapon, weaponDisplay, muzzle, muzzleDisplay, magazine, magazineDisplay,
 ammo, fireMode, positions, initialVelocity, hitParts, sim, isSub]

Test plan

• Verify projectile tracking works in-game (fire weapons, check extension receives data)
• Verify submunitions are tracked correctly (shotguns, cluster munitions)
• Confirm no more :TIMESTAMP: errors in RPT log