* Fix some bugs where looping doesn't work with the resource manager.
* Fix a crash when seeking a sound.
* Fix a subtle bug the results in a glitch when looping a decoder when resampling is being applied.
* Fix an issue where chaining streams would not result in a seamless transition.
* Add a new flag called MA_RESOURCE_MANAGER_DATA_SOURCE_FLAG_UNKNOWN_LENGTH for use with resource managed data sources. This flag is used as a hint to the resource manager that the length of the data source is unknown and calling ma_data_source_get_length_in_pcm_frames() should be avoided.
* Add support for resetting a resampler. This is useful for resetting the internal timer and clearing the internal cache for when you want to seek the input sound source back to the start.
* Add support for clearing the cache from biquads and low-pass filters.
