Gnumch-equality, add new gnumch games type.
Add new types :
* Inequality
* Multiples
* Factors
* Primes

This commit also separates the muncher from the main file (Gnumch.qml) to
its own qml file (Muncher.qml).
Gnumch-equality, use of AnimatedSprite instead of AnimatedImage for creatures.
Gnumch, Add Gnumch-factors, Gnumch-inequality, Gnumch-multiples, Gnumch-primes.
Gnumch, use background's id instead of the depracated main id.