add basic dialogues

[stolsky]

• [x] structure dialog data
• [x] structure/design UI
• [x] implement UI
• [x] implement closing dialogue after finished
• [x] implement arranging of speech bubbles
• [x] basic style UI
• [x] add thoughts bubble move to #42
• [x] add sounds bubble
• [x] add fade-out-effect (white) at top and button moved to #42
• [x] start with simple dialog without choices
• [x] add start animation
• [x] add end animation