simplify logger creation (move logic into a function in main packages)

Ensure logger creation is consistent between Web and Collector
Create logger in main, pass down to downstream functions (like gin)
In debug mode, print a copy of AppConfig
Better debugging for logger.

webapp/backend/pkg/web/handler/save_settings.go

@@ -9,7 +9,7 @@ import (
 )
 
 func SaveSettings(c *gin.Context) {
-	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
+	logger := c.MustGet("LOGGER").(*logrus.Entry)
 	deviceRepo := c.MustGet("DEVICE_REPOSITORY").(database.DeviceRepo)
 
 	var settings models.Settings