Move tile-wide traits out of serial_feature

serial.hpp

@@ -99,13 +99,9 @@ struct serial_feature {
 	int dropped = FEATURE_DROPPED;	// was this feature dropped by rate?
 
 	// unsigned long long drop_by;  // dot-dropping priority
-	bool reduced;	   // is polygon dust
-	bool coalesced;	   // was coalesced from multiple features
-	int line_detail;   // current tile resolution being used for simplification
-	int extra_detail;  // extra tile resolution to retain in output
-	int maxzoom;
+	bool reduced;				       // is polygon dust
+	bool coalesced;				       // was coalesced from multiple features
 	double spacing;				       // feature spacing for --calculate-feature-density
-	double simplification;			       // simplification level at this zoom level
 	std::vector<ssize_t> arc_polygon;	       // used in --detect-shared-borders
 	ssize_t renamed;			       // used in --detect-shared-borders logic
 	long long clustered;			       // does this feature need the clustered/point_count attributes?
@@ -113,10 +109,6 @@ struct serial_feature {
 	std::shared_ptr<std::string> tile_stringpool;  // string pool for mvt_value construction
 	std::set<std::string> need_tilestats;
 	std::unordered_map<std::string, accum_state> attribute_accum_state;
-
-	int z;	// tile being produced
-	int tx;
-	int ty;
 };
 
 std::string serialize_feature(serial_feature *sf, long long wx, long long wy);