Feature Request: Playlist Export To Device

Before posting

Please follow the steps below and check the boxes with [x] once you did the step.

[x] I checked the issue tracker for similar issues
[x] I checked the changelog if the issue is already resolved
[x] I tried the latest Clementine build from here ^ I'm actually using the development build.

System information

Please provide information about your system and the version of Clementine used.

Operating System: Linux Mint 18.2
Clementine version: Source

Feature Request

"Copy to device" is very convenient, because I can copy the songs from a playlist, or from my entire library to an external device. To build off of this, I propose an "Export Playlist To Device" feature to handle differing paths on the device.

My current workflow is the following for a device that supports .m3u playlists:

Ensure I have replicated the same naming file hierarchy from my computer on my external device.
Save the playlist I want to export as a .m3u playlist.
Open the playlist in my favorite text editor and find/replace all paths of my local directory ("/home/user1/Music/") with what my device understands ("/\<microSD1>/Music/")
Manually copy the playlist to my device

In the ideal case, Clementine could handle the export of a playlist in a similar interface to playlist save, or as an additional set of configurations in a Copy To Device dialog where clementine could go through a SongList and generate an output playlist file with the appropriate paths on the device.

This feature could also definitely leverage "Naming Options Profiles" from https://github.com/clementine-player/Clementine/issues/5620 for more seamless device integration.

clementine-player / Clementine