Using VanillaCommandListener14 for 1.15 as well
Using a mock for the DiscordPlayerSender too, to reduce the amount of code
Made the mocks stub-only, which should lower memory usage
Fixed occasional ConcurrentModificationException with the custom chat loading
Waiting much less on MC command responses (0.2s instead of 0.5s)
Made the #bot channel configurable
Linking the #bot channel everywhere it's mentioned
#51
