smp-v4.7.1-0

Bring in upstream release v4.7.1

Includes the following PRs:

• Publish source files
• Publish externals
• TV compatibility fix: Use unnamed Regex capture groups
• TV compatibility fix: Upgrade bcp-47 deps to remove usage of the ECMAScript Internationalisation API (Intl)
• TV compatibility fix: Emit waiting and playing events when a stream has stalled
• Split out hybridBufferTime from stableBufferTime
• Implement portalScale and portalMinimum
• Emit event on content length mismatch of header content length and payload
• Add blacklistExpiry for BaseUrlController and BaseURL change events
• Add setMediaDuration for duration override
• Add refreshManifest