Merge pull request #1118 from tschneidereit/globals

Implement builtins in flash/text
Merge pull request #1119 from tschneidereit/globals

More builtins (flash/media and DRM removal)
Merge pull request #1120 from tschneidereit/globals

Remove all Worker- and concurrency-related builtins
Merge pull request #1121 from tschneidereit/globals

Yet more builtins
Stub implementations of socket-related builtins