Add Inter-Process Communication

todo.md

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+# todo
+## ipc
+add ipc functionality so it's possible while the program runs to:
+- play next and previous track with `cimp --next` and `cimp --prev`
+- change volume with `cimp --volume xx`
+- add file to playlist with `cimp --add filename.ext`
+- if started without `--add` it should clear the playlist and load and play the given file or playlist.
+- if given the flag `--playlist` it should output the song array as a playlist.
+
+the c functions are ready in terminkey.h and an example of how it works is found in test_ipc.bas
+
+## recurcive add all music in folder