Merge pull request #64 from holzgeist/fix-export-mediastreamtrack

fix: export mediastreamtrack

fix analyzer.

release: 1.5.4+hotfix.4

release: 1.5.3+hotfix.3.

fix: fix bug for dc.onMessage.

hotfix: Add getter override for dc.bufferedAmountLowThreshold.

release: 1.5.3.

release: 1.5.2.

release: 1.5.2+hotfix.1.

fix E2EE for firefox.