When using Apple style Mp4 tags the tmpo property which normally is translated to BPM is not fetched from audio file metadata.
This adds this feature without fixing other problems, e.g. when changing tags within clementine existing but unchanged tags become deranged. I strongly suggest to change taglib interface in a way kid3 is using (explicit adding/removing tags).
The minor change within utilities is just to  avoid searching for a file within huge direcories as simply showing directory without positioning or at least highlighting is unuseable.

…dded

to allow single tag editting while the original method SaveFile was overtwriting existing tags with invalid data. Therefor the original method now only effects basic attributes as required e.g. after ripping.

in single tag mode. This avoids to overwrite uneffected properties
within audiofiles as it occured when using SaveFile interface.
Quite sure not all names are used for tagging, only those  marked
edittable can be updated/inserted/removed.
The names are taken from taglib translations when available (by convention
written in uppercase allthough taglib name mapping is caseinsensitive).
Main source:  3rdparty/taglib/.../id3v2frame translations.
Names written lowercase miss a taglib equivalent and are used for
internal informations.
Note: When adding lines to column enumeration: Try to add mappable taglib
properties.

When using Apple style Mp4 tags the tmpo property which normally is translated to BPM is not fetched from audio file metadata.
This adds this feature without fixing other problems, e.g. when changing tags within clementine existing but unchanged tags become deranged. I strongly suggest to change taglib interface in a way kid3 is using (explicit adding/removing tags).
The minor change within utilities is just to  avoid searching for a file within huge direcories as simply showing directory without positioning or at least highlighting is unuseable.

…dded

to allow single tag editting while the original method SaveFile was overtwriting existing tags with invalid data. Therefor the original method now only effects basic attributes as required e.g. after ripping.

in single tag mode. This avoids to overwrite uneffected properties
within audiofiles as it occured when using SaveFile interface.
Quite sure not all names are used for tagging, only those  marked
edittable can be updated/inserted/removed.
The names are taken from taglib translations when available (by convention
written in uppercase allthough taglib name mapping is caseinsensitive).
Main source:  3rdparty/taglib/.../id3v2frame translations.
Names written lowercase miss a taglib equivalent and are used for
internal informations.
Note: When adding lines to column enumeration: Try to add mappable taglib
properties.

…ug) removed

…gLog(Debug) removed"

This reverts commit adc1fab.

mp4 tag 'tmpo'.
Main change: Instead of posting whole song properties to external tagreader
only single tag (aka the one just editted) is posted. That required a new
tagreader interface.
As a side effect the tag translation which differs depending on
audio file type (mp3, aac, flac, ...) is delegated to propertymap in
3rdparty tagreader. On the other hand tagname are made available to
playlist class (matching the columns enumeration) which should provide an
easier way to add additional filepersistent tags.