implement WriteTag wipeout and shrinking options #59
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Added implementation for shrinking/wipeout the remaining space when tag size decreases.
This can be controlled by options; however, the defaults are set to shrink the file (if applicable).
This is usefull if tags are removed (especially pictures) or when tags are added/removed/added/removed several times; otherwise the file size will always increase and the removed tag data will remain in the file.