Splash screen while waiting for Nammu to open

[raquelalegre]

It takes around 6-8 seconds in my laptop for Nammu to open, and if it's the first time your open it, you don't know if it's working or not.

I've come across this Java SplashScreen class and it seems to work fine when running the JAR. Need to:

• Test with DMG, EXE and JAR in other systems.
• Get a proper image for Nammu or a "Nammu is loading" gif. I'm using this one for now.

[raquelalegre]

SplashScreen doesn't work in DMG or EXE, only JAR files. I think they need to be configured in an entire different way as they are configured in the JAR.