* implemented xdg thumbnails fetching with fallback on mimetype icons for menu entries in filebrowser mode
* included original license text
* added md5 header and source file
* implemented xdg compatible thumbnail's creation
* added -preview-cmd string option to program settings
* support custom command to create images for entries with thumbnail:// prefix
* fix custom thumbnailer command crash caused by null uri when entry is not a valid filename
* check entry_name is not NULL or empty when generating thumbnails;
use snprintf to avoid static analyzer complains
* avoid using gstrvbuilder to build thumbnailer command args
* fixed static analyzer complain about always wrong condition
* use g_spawn_check_exit_status to avoid bump to glib 2.70
* removed md5-c dependency and use glib checksum implementation
* fixed meson build after md5-c library removal
* support thumbnail generation in recursivebrowser mode
* restored check rofi_icon_fetcher_file_is_image
* create thumbnail directories if not existing
* use g_malloc0, g_strdup and g_strdup_printf
* fixed formatting with clang-format
* don't wait for jobs in execution when finalizing the icon fetcher worker threadpool
* destroy and rebuild the icon fetcher worker threadpool when the current page is changed
* added query_started boolean member to IconFetcherEntry;
check if an icon fetcher query was started on an IconFetcherEntry and submit the query again otherwise
* force icon cache lookup even if the item has a valid icon_fetch_uid (the fetching job could have been discarded before starting)
* search binaries in PATH when executing thumbnailer command
* mark icon query as not started in threadpool item free_func
* added listview page_changed_callback; rebuild icon fetcher threadpool in page_changed_callback
* [listview] Add missing code documentation param
* Create rofi-thumbnails.5.markdown
* Updated documentation with apparmor issues and workaround
* [Doc] Ship rofi-thumbnails.5
With some formatting fixes
* use a more compact thumbnailer example
---------
Co-authored-by: giomatfois62 <giomatfois62@yahoo.it>
Co-authored-by: Dave Davenport <DaveDavenport@users.noreply.github.com>
Co-authored-by: lbonn <github@lbonnans.net>
