JPEG XL Toolbox app for iPhone and iPad

This application offers various JPEG XL (JXL) functionalities.

Supports:
* ProRAW DNG -> DNG
- Lossless compression, about 1/2 of the original size
- Lossy compression, about 1/6 of the original size

* ProRAW DNG -> JXL
- Lossy conversion, about 1/7 of the original size

* DNG -> JXL
- Lossy conversion, about 1/7 of the original size

* HEIF -> JXL
- Lossy conversion

* JPEG -> JXL
- Lossless conversion

Features:
* Keeps the internal metadata
* Preserves 16-bit depth
* Preserves HDR display effects in iOS Photos App
* Batch conversion capabilities


=== CHNAGELOG ===
* Bumps libjxl to v0.10.2
* Adjusts settings view

* Improves processing speed significantly
* Adds lossless mode for ProRAW compression
* Uses 7 as the default effort

* Adds ProRAW direct compression

* Settings page adjustment
* Some UI improvements

* Adds Pro version purchase
* Adds several ProRAW parameters in settings for Pro version
* Adds decoding speed in settings
* Low memory mode now allows devices with 4GB RAM to convert 48M ProRAW

* Uses lossless encoding for JPEG automatically
* Adds Modular mode support
* Adds Progressive mode support
* Adds Colorspace support
* Keeps HDR effect when converting from ProRAW

* Adds support for ProRAW to lossy JPEG XL conversion
* Adds Batch conversion
* Keeps DNG Metadata in JXL
* Adds quality and effort in settings