update to flashls.swc v0.3.0

this PR will update MediaElement.js HLS support from flashls.swc v0.1.0 to v0.3.0
refer to https://github.com/mangui/flashls/releases/tag/v0.3.0, https://github.com/mangui/flashls/releases/tag/v0.2.0 and https://github.com/mangui/flashls/releases/tag/v0.1.1
for improvement/bugfix list