In version 3.0 the following things changed which potentially call for change in your code:

CGImage has moved from Namespace EinhugurMacOSBridge to EinhugurCoreBridge
NSObject has moved from Namespace EinhugurMacOSBridge to EinhugurCoreBridge

NSNumber has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge
NSArray has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge
NSMutableArray has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge
NSDictionary has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge
NSMutableDictionary has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge
NSUserDefaults has moved from EinhugurMacOSBridgeContainers to EinhugurCoreBridge

ColorPickerActionDelegate has changed to take EinhugurMacOSBridge.NSColor instead of Color in last parameter.

Changed NSColorList to use NSColor instead of Color.