Switched assertion library from Node's "assert" to "chai".

package.json

tests/tests/messages/statelessCommands.ts

tests/tests/utility.config.ts

tests/tests/utility.keyValuePair.ts

tests/tests/utility.localisation.ts

tests/tests/utility.tokenString.ts

tests/tests/utility.utils.ts

tests/tests/wichtelbot.classes.member.ts

tests/tests/wichtelbot.clients.discord.ts

tests/tests/wichtelbot.database.ts

tests/tests/wichtelbot.message.definitions.message.ts

tests/tests/wichtelbot.message.handler.ts