Once features can't possibly fit in a tile, stop trying (#9)

* Stop adding features to a tile if it can't possibly work

* Add --integer and --fraction options to tippecanoe-decode

* Carry the strategies field from tileset metadata through tile-join

* Update changelog

* Assign different codes to different kinds of error exits

errors.hpp

@@ -0,0 +1,21 @@
+#define EXIT_INCOMPLETE 100
+#define EXIT_ARGS 101
+#define EXIT_CLOSE 102
+#define EXIT_CSV 103
+#define EXIT_EXISTS 104
+#define EXIT_FILTER 105
+#define EXIT_IMPOSSIBLE 106
+#define EXIT_JSON 107
+#define EXIT_MEMORY 108
+#define EXIT_MVT 109
+#define EXIT_NODATA 110
+#define EXIT_OPEN 111
+#define EXIT_PROTOBUF 112
+#define EXIT_PTHREAD 113
+#define EXIT_READ 114
+#define EXIT_SEEK 115
+#define EXIT_SQLITE 116
+#define EXIT_STAT 117
+#define EXIT_UNLINK 118
+#define EXIT_UTF8 119
+#define EXIT_WRITE 120