Merge branch 'develop' into soru/try-as-webhook

.mocharc.yml

config/config.sample.yaml

config/config.schema.yaml

package-lock.json

package.json

src/bot.ts

src/channelsyncroniser.ts

src/config.ts

src/matrixeventprocessor.ts

src/metrics.ts

src/usersyncroniser.ts

src/util.ts

test/mocha.opts

test/test_channelsyncroniser.ts

test/test_config.ts

test/test_discordbot.ts

test/test_discordmessageprocessor.ts

test/test_matrixeventprocessor.ts

test/test_usersyncroniser.ts

tools/adminme.ts