Merge remote-tracking branch 'origin/dev' into 1.13

# Conflicts:
#	src/main/java/net/glowstone/entity/GlowLivingEntity.java
#	src/main/java/net/glowstone/net/http/HttpClient.java
#	src/main/java/net/glowstone/net/protocol/LoginProtocol.java
#	src/test/java/net/glowstone/net/LoginProtocolTest.java