Config: Add versioning (#1671)

* Config: Version Management

* Engine: Improve visibility of TestConfigAllJsonResponse failures

* Config: Update cmd/config to allow upgrades

* Config: Add Version2 to rename GDAX

* Config: Restructure versioning to share types

This restructure allows us to share types between versions, avoids
needing to import the versions, and puts the test fixtures in same
package.
It's a win on all fronts

* Config: Fix SetNTPCheck using log

Called from engine before logger is inited, and also just wrong to use
log to communicate with user

* Config: Improve TestMigrateConfig

* Config: Drop requirement for versions to be registered in sequence

Checking the versions at Deploy is much saner.

* Config: Fix file encrypted but flag not set

* Config: Add -edit and encryption upgrade to cmd/config

This simplifies the handling for encryption prompts by moving it to a
field on config, allowing us to simplify all the places were were
passing around config

Also moves password entry to being secure (echo-off)

* Tests: Fix inconsistent should/must assertions

engine/engine.go

@@ -134,7 +134,7 @@ func loadConfigWithSettings(settings *Settings, flagSet map[string]bool) (*confi
 	conf := &config.Config{}
 	err = conf.ReadConfigFromFile(filePath, settings.EnableDryRun)
 	if err != nil {
-		return nil, fmt.Errorf(config.ErrFailureOpeningConfig, filePath, err)
+		return nil, fmt.Errorf("%w %s: %w", config.ErrFailureOpeningConfig, filePath, err)
 	}
 	// Apply overrides from settings
 	if flagSet["datadir"] {