bug fix.

Fixed an issue where playback speed is faster in the case of less than
44100 sampling rate.サンプリングレートが44100未満の場合に再生速度が速くなる問題を修正。
#OggDecoder.
change Supports SampleMultiplier of PCMRingBuffer.write
_proc_packet_body, in _proc_packet_seekPCM method.

_proc_packet_body,_proc_packet_seekPCMメソッドでPCMRingBuffer.writeのSampleMultiplierに対応。
#PCMRingBuffer.
add writePCMbyMultiplier method.
change writePCM method. add argments inSampleMultiplier. and use
writePCMbyMultiplier.
#RingBuffer.
Fixed a bug that would read in greater than or equal to the length of
overflow in the read method.
read メソッドでオーバーフローの長さ以上に読み込んでしまう不具合を修正。
Channels. setVolume,setPan,getVolume,getPan. if soundchannel == null.
WaveSound.hx. on AIR. allowCodeImport SecurityError.
OggDecoder.hx. buffer size multiplier samplerate fixed 44100.