Fix FLV video playback bug introduced in 09982effa023e3bda8462b811caa5f47535e333f

• Fix broken ES5 compatibility in v1.6.0 #232

• Migrate build system to Webpack 5 + TypeScript compiler
• New silent frame insert algorithm for improving a/v unsync #354
• FetchStreamLoader: Use AbortController to abort download #448 #535
• FLVDemuxer: Skip FLV tags with malformed timestamps #671

This version adds new API and features without breaking any existing interface and compatibility.

• Support additional request headers when fire http request
• Add custom loader support (config.customLoader)
• Add METADATA_ARRIVED callback event for onMetaData script data received
• Add SCRIPTDATA_ARRIVED callback event for any AMF script data received
• Update flv.d.ts TypeScript Declaration File

• Fix Source too large exception caused by incorrect byte length in MP4Remuxer
• Fix potential exception under Edge when do removeSourceBuffer in MSEController

• FetchStreamLoader: Fix potential undetected Early-EOF in latest Chrome which still notifies stream done

• Fix multipart duration overflow caused by inaccurate segment duration in MediaDataSource

• Export H.264 ref_frames into MediaInfo player.mediaInfo.refFrames

• Support negative cts offset in flv packet
• Avoid using second last sample duration to keep accurate in MP4Remuxer, this will help with some a/v unsync cases which has unstable network or framerate.
• Fix withCredentials options not working in xhr-moz-chunked-loader and xhr-range-loader
• Fix null reference bug intruduced in v1.3.4

• Refine last sample duration calculation logic in MP4Remuxer to be accurate
• This will fix potential a/v unsync if under low connection speed

• Fix FetchStreamLoader memory leak caused by infinite Promise waiting, thanks to @spacemeowx2
• XhrRangeLoader: Avoid full request if filesize is provided in MediaDataSource
• Ignore invalid data if request error (such as 403, 404)

• Add logcat callback interface flvjs.LoggingControl.addLogListener(listener)
• Add config.fixAudioTimestampGap field to indicate whether to generate silent frames for audio gap

• Disable silent frame generating under Safari temporarily because of unknown SourceBuffer exception