Move channel ETS table creation to channel mod.
Fix missing create_ets_table function.
Replace new_token() with new_unique_token_id().
Add logplex_token:cache/1.
Add logplex_token:new(TokenId, ChannelId).
Conflicts:
	src/logplex_token.erl
Move token table creation to token module.
Move logplex drain table creation into module.
Fix new_token_id to be printable and export fn.
Export token type.
Maintain a channel_id->token_id index.
Re-arrange exports.
Switch nsync to use logplex_token functions.
Update logplex_channel to use logplex_token funs.
Convenience logplex_token:new(Chan, Name) fn.
Add lookup_ids_by_channel, delete_by_channel.
Create now uses store underneath.
Adds a test suite for recent token changes.
Use field position for keypos in all create_ets.
Test delete_by_channel as well.
Save memory in lookup_ids_by_channel.

Costs a try-catch instead.