cpp11bigwig 0.3.0

• Fix a CRAN gcc-san (UBSan) load of misaligned address runtime error when
  reading a bigBed block that packs more than one record. In libBigWig's
  bwValues.c, records are stored as three uint32_t fields followed by a
  variable-length name, so every record after the first starts on an
  unaligned offset; the fields are now read with memcpy instead of an
  aligned uint32_t cast.

• Multi-range queries now open the file once per call instead of re-opening it
  for every range. The per-range loop moved into C++, so a query of many ranges
  (and especially a remote file, where each open re-fetches headers) is
  substantially faster.

• read_bigbed() no longer crashes on a bigBed file with no embedded autoSql
  schema. bbGetSQL() returns NULL in that case, and constructing a
  std::string from it was undefined behavior; such files now read back their
  chrom/start/end columns with no extra typed fields.

• The bigWig/bigBed readers now release the libBigWig file handle and read
  buffer when they error out (e.g. on an unreadable file or a failed interval
  query), rather than leaking them.

• Fix a CRAN gcc-ASAN global-buffer-overflow reported when reading bigBed
  files. The autoSql schema parser no longer uses std::regex (which tripped
  an AddressSanitizer error inside libstdc++); it now parses the schema with
  simple string operations.

• read_bigwig() and read_bigbed() can now query multiple ranges in a single
  call. Pass equal-length (or length-1, recycled) chrom, start, and end
  vectors, or a GRanges of regions via chrom. For read_bigwig(as = "Rle"),
  a multi-range query returns a named RleList with one element per range
  (#18).