Primtive server-> client file sending

Signed-off-by: Chris Sanders <zidane@outlook.com>
Fix upside down backgrounds, add spout license to DownloadLinkCodec,
DownloadLinkMessage, GLGCFactory
Signed-off-by: Unknownloner <unknownloner.online@gmail.com>
Merge branch 'master' of https://github.com/AlmuraDev/SpoutcraftMod