SP_PLAYLIST_TYPE_PLACEHOLDER can be treated exactly like a SP_PLAYLIST_TYPE_END_FOLDER
PLAYLIST_TYPE_PLACEHOLDER constant
Added QtCreator files and node_modules to gitignore.
Merge pull request #63 from nzoschke/issue-37
SP_PLAYLIST_TYPE_PLACEHOLDER can be treated exactly like a SP_PLAYLIST_TYPE_END_FOLDER

# especiallg if itemerges an updated upstream into a topic branch.
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