Hy-tools

- Updated ENVI reader to handle files with extensions
- Check for water pixels before glint correction

- Added band threshold masker

- Added write mode argument for header file creation

- Added ancillary mask matching, hytools will check if 'no data' extents match, if not the mask will be updated.
- Fixed bug that caused crash in python 3.8 when running flex BRDF correction.
- User can now specify whether ENVI file has an extension, default is FALSE.
- Miscellaneous bug fixes.
- Removed .imgspec folder, no longer needed.
- Made ENVI default filetype when reading a file

Zenodo DOI creation

- Glint correction module has been added and includes 3 correction methods from the following papers:
1. [Hochberg et al. 2003 ](https://doi.org/10.1109/TGRS.2003.815408)
2. [Hedley et al. 2005](https://doi.org/10.1080/01431160500034086)
3. [Gao and Li 2021](https://doi.org/10.21926/aeer.2103017)
- Added example configuration files for running glint correction with topographic and BRDF corrections
- Added pixel writer to ENVI IO options
- ImgSPEC scripts and configuration files added
- Miscellaneous bug fixes