Implement Demos in Swift

[broadwaylamb]

LibHaru has some demo programs that show different use cases.

Need to rewrite them in Swift (probably via Playgrounds) as soon as the needed functionality is implemented.

• [x] Font Demo
• [x] Line Demo
• [x] Text Demo
• [ ] Text Demo 2
• [ ] PNG Demo
• [ ] JPG Demo
• [ ] Raw Image Demo
• [ ] Encoding List
• [ ] Encryption
• [ ] Permission
• [x] Arc Demo
• [x] TrueType Font Demo
• [ ] Text Annotation
• [ ] Link Annotation
• [ ] Outline Demo
• [ ] Japanese font
• [ ] Image Demo
• [ ] Character Map
• [x] Grid Sheet