EasyViewer-epub,Comic,Text,PDF

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- Add keyboard shortcuts
- Fix landscape mode UI bug
- Brightness control (Thanks to 덕주)
Add [Apply to main screen] option
- Thumbnail (book cover) settings (Thanks to 민수)
Support image files on device
- image filter (Thanks to Romain Daubenfeld)
Add color adjustment (hue/brightness/saturation/contrast)
- Fix file sorting algorithm (Thanks to 서진)
- Add thumbnail cache option (Thanks to 그린티프라프치노)
- Add touch area size adjustment option (Thanks to himps)