Sets version to 0.23.0-dev
Fixes setParentFolderLabels=false.
Minor refactoring.
Adds EXIF and PHP version to info page.
Ignore warnings for unsupported images.
Adds .aiff extention to type audio.
Updates pl translation.
Replace 'which' with 'command -v' to be POSIX compatible here.
Updates build process.
Some updates on the info page.
Updates readme.
Updates readme.
Fix.
Adds alt attributes to fallback img elements.
Cleans fallback code.
Cleans styles.
Styles.
Adds generic preview.
Updates image preview.
Updates text preview.