Let user set a name for a device or autogenerate it

Description

Let user set a name for a device or autogenerate it.

Related Issue

#100 (closed)

Motivation and Context

Users should have the chance to interact with human readable device names instead of UUIDs only.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

nucleus/errors/errors.go

@@ -41,6 +41,14 @@ func (e *ErrAlreadyExists) Error() string {
 	return fmt.Sprintf("%v already exists", e.Item)
 }
 
+// ErrNoValidUUID implements the Error interface and is called if a UUID is not valid.
+type ErrNoValidUUID struct {
+}
+
+func (e *ErrNoValidUUID) Error() string {
+	return fmt.Sprintf("UUID not valid")
+}
+
 // ErrInvalidTypeAssertion implements the Error interface and is called if the
 // type of a storable item does not correspond to the expected type.
 type ErrInvalidTypeAssertion struct {