clarify audio looping, reposition setup items

clarify audio looping, if background audio is too short then randomly choose from specified audio files to pad it
reposition items in the config file so commonly used ones are at the top

README.md

@@ -144,7 +144,7 @@ Look for and change the settings you need. Please be careful or you will have to
 
 **At a minimum:**
 - `ROOT_FOLDER_SOURCES_LIST_FOR_IMAGES_PICS` - specify one or more quoted and comma separated Folder names of pics/videos
-- `BACKGROUND_AUDIO_INPUT_FOLDER` - specify a Folder containing audio files (in sequence) to make an audio background track (it is not looped if too short). No files in folder = silent background
+- `BACKGROUND_AUDIO_INPUT_FOLDER` - specify a Folder containing audio files (in sequence) to make an audio background track (it is random looped if too short). No files in folder = silent background
 - `FINAL_MP4_WITH_AUDIO_FILENAME` - specify the directory and filename of the FINAL slideshow .mp4    
 
 **Optionally:**    
@@ -168,11 +168,11 @@ settings = {
 		r'H:\our_home_pics\1994',
 		r'H:\our_home_pics\1995',
 	],	# a list, one or more folders to look in for slideshow pics/videos. the r in front of the string is CRITICAL
+	'FINAL_MP4_WITH_AUDIO_FILENAME':	r'D:\some_existing_directory\slideshow_1994_1995.mp4',		# the filename of the FINAL slideshow .mp4
+	'BACKGROUND_AUDIO_INPUT_FOLDER':	r'H:\some_existing_directory\BACKGROUND_AUDIO_INPUT_FOLDER',		# Folder containing audio files (in sequence) to make an audio background track (it is random looped if too short). No files = silent background.
 	'SORT_TYPE':	'alphabetic_files_folders',		# One of ['alphabetic_files_folders', 'alphabetic', 'win_files_folders', 'win_files', 'random']. "win" types sort using numbers in filenames as well regardless of their text length in the filename, per Windows File Explorer.
 	'RECURSIVE':	True,		# case sensitive: whether to recurse the source folder(s) looking for slideshow pics/videos
 	'TEMP_FOLDER':	r'D:\QN_Auto_Slideshow_Creator_for_Windows\TEMP',		# folder where temporary files go; USE A DISK WITH LOTS OF SPARE DISK SPACE - CIRCA 6 GB PER 100 PICS/VIDEOS
-	'BACKGROUND_AUDIO_INPUT_FOLDER':	r'H:\some_existing_directory\BACKGROUND_AUDIO_INPUT_FOLDER',		# Folder containing audio files (in sequence) to make an audio background track (it is not looped if too short). No files = silent background.
-	'FINAL_MP4_WITH_AUDIO_FILENAME':	r'D:\some_existing_directory\slideshow_1994_1995.mp4',		# the filename of the FINAL slideshow .mp4
 	'SUBTITLE_DEPTH':	0,		# how many folders deep to display in subtitles; use 0 for no subtitling
 	'SUBTITLE_FONTSIZE':	18,		# fontsize for subtitles, leave this alone unless confident
 	'SUBTITLE_FONTSCALE':	1.0,		# fontscale for subtitles, leave this alone unless confident

slideshow_LOAD_SETTINGS.py

@@ -755,11 +755,11 @@ def load_settings():
 		valid_bitrates = [ { i : valid_TARGET_RESOLUTION[i]["BITRATE"] } for i in valid_TARGET_RESOLUTION.keys() ]
 		specially_formatted_settings_list =	[
 										[ 'ROOT_FOLDER_SOURCES_LIST_FOR_IMAGES_PICS',	ROOT_FOLDER_SOURCES_LIST_FOR_IMAGES_PICS,	r'a list, one or more folders to look in for slideshow pics/videos. the r in front of the string is CRITICAL' ],
+										[ 'BACKGROUND_AUDIO_INPUT_FOLDER',				BACKGROUND_AUDIO_INPUT_FOLDER,				r'Folder containing audio files (in sequence) to make an audio background track (it is random looped if too short). No files = silent background.' ],
+										[ 'FINAL_MP4_WITH_AUDIO_FILENAME',				FINAL_MP4_WITH_AUDIO_FILENAME,				r'the filename of the FINAL slideshow .mp4' ],
 										[ 'SORT_TYPE',									SORT_TYPE,									f'One of {valid_SORT_TYPES}. "win" types sort using numbers in filenames as well regardless of their text length in the filename, per Windows File Explorer.' ],
 										[ 'RECURSIVE',									RECURSIVE,									r'case sensitive: whether to recurse the source folder(s) looking for slideshow pics/videos' ],
 										[ 'TEMP_FOLDER',								TEMP_FOLDER,								r'folder where temporary files go; USE A DISK WITH LOTS OF SPARE DISK SPACE - CIRCA 6 GB PER 100 PICS/VIDEOS' ],
-										[ 'BACKGROUND_AUDIO_INPUT_FOLDER',				BACKGROUND_AUDIO_INPUT_FOLDER,				r'Folder containing audio files (in sequence) to make an audio background track (it is not looped if too short). No files = silent background.' ],
-										[ 'FINAL_MP4_WITH_AUDIO_FILENAME',				FINAL_MP4_WITH_AUDIO_FILENAME,				r'the filename of the FINAL slideshow .mp4' ],
 										[ 'SUBTITLE_DEPTH',								SUBTITLE_DEPTH,								r'how many folders deep to display in subtitles; use 0 for no subtitling' ],
 										[ 'SUBTITLE_FONTSIZE',							SUBTITLE_FONTSIZE,							r'fontsize for subtitles, leave this alone unless confident' ],
 										[ 'SUBTITLE_FONTSCALE',							SUBTITLE_FONTSCALE,							r'fontscale for subtitles, leave this alone unless confident' ],