[DEV] Add encoding in pom.xml
[MOD] Change the invisible keyword in config.
[ADD] Config for stay online when invisible. See #464
[DEV] Better log of exceptions in debugLog.
[DEV][REFLECTION] Add new reflection to get packet class.
Thanks at @aadnk for his code.
[README] Updated about ProtocolLib of @aadnk
[OPTIMIZE] Correcting some reflection use.
[ADD] Possiblity to send packet. See #464
[MOD] Set online the player if chosen in the configuration. See #464
[FIX] Compilation fix. 
Remove unused part.
[FIX] Wrong use of reflection when importing lib.
[FIX] Reflection to get NetServerHandler. See #464
[FIX] Reflection with accessibility of field.
[FIX] Some correction for the packet of Online. See #464
[OPTIMIZATION] Of the Invisible feature. See #464
[FIX] Correction of name of sendPacket method. See #464
[MOD] Use the invisible_online from the config. See #464
If the player should be considred online when insivisible, he can be
then contacted by PM and also teleported to.

This config override the invisible_fakequit.