Caches static symbol properties (e.g., point size, tick value, volume constraints) in global variables during the EA's `OnInit` phase.
This change refactors the `OpenBuyTrade`, `OpenSellTrade`, `CalculateSL`, `CalculateTP`, and `CalculateLots` functions to use these cached values instead of making repeated, performance-intensive `SymbolInfo...` calls within the `OnTick` hot path. This significantly reduces the EA's per-tick processing overhead.
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