Lazy loading for glyph images into RAM, instead of caching at layout level we will cache only when rendering.
Try to run test application, and hit `scale font`
** RAM consumption (Accelerated Rendering) **
| Before | After |
|-------:|-------|
| 111.9 | 21.8 |
| 204.8 | 24.4 |
| 298.0 | 26.3 |
| 391.5 | 28.4 |
| 484.8 | 29.9 |
| 578.1 | 31.4 |
| 671.4 | 32.5 |
** RAM consumption (SW Rendering) **
| Before | After |
|-------:|-------|
| 104 | 14.6 |
| 197 | 17 |
| 290 | 19.1 |
| 384 | 21.2 |
| 477 | 22.8 |
| 571 | 24.3 |
| 664 | 25.6 |