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b8a6deddf5
When no text sensor filters are configured, the entire Filter class hierarchy (filter.h/filter.cpp) was still compiled and linked. This pulled in std::string manipulation code (_M_mutate, _M_create, _M_append, _M_replace, _M_assign, _M_dispose) that is only needed for filter chain processing. Add USE_TEXT_SENSOR_FILTER define that is only emitted when at least one text sensor has filters configured. Wrap filter-related code behind this define to eliminate dead code from the binary. Saves ~340 bytes of flash on configs with filterless text sensors.
