Bringing chat up to par with the rest of the plugin

[PureTryOut]

• Adds nation chat. Chat send in this channel will only be send to people in the same nation as the sender
• Switches conditional statements to have the failure case first, and succesful cases afterwards like the other commits recently
• Switched chat functions around to have the channels with the biggest range on top, smallest on bottom. So currently global, nation, town, local. This applies everywhere in chat.lua
• Players will now be reset to global chat if they are in the town channel when leaving a town
• Players will now be reset to town chat if they are in the nation channel when their town leaves a nation