Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

internal/oauth/clientstore_test.go

@@ -49,6 +49,8 @@ func (suite *PgClientStoreTestSuite) SetupSuite() {
 
 // SetupTest creates a postgres connection and creates the oauth_clients table before each test
 func (suite *PgClientStoreTestSuite) SetupTest() {
+	testrig.InitTestLog()
+	testrig.InitTestConfig()
 	suite.db = testrig.NewTestDB()
 	testrig.StandardDBSetup(suite.db, nil)
 }