Change licence to LGPL for the core part, keep GPL for extra

[DjThunder]

Use LGPL licence for the standard LionEngine library:

• lionengine-core
• lionengine-core-awt
• lionengine-core-swt
• lionengine-core-android
• lionengine-audio-wav
• lionengine-audio-midi
• lionengine-audio-sc68
• lionengine-network
• lionengine-game
• lionengine-game-platform
• lionengine-game-pathfinding
• lionengine-game-strategy
• lionengine-examples
• lionengine-tutorials

Keep GPL for tools and applications:

• lionengine-editor

[DjThunder]

Cancelled.