plugins: restore elan-wave-segment plugin

[thijstriemstra]

fixes #1745

[coveralls]

Coverage increased (+1.3%) to 80.984% when pulling 06b8607 on elan-wave-1745 into 8ba3328 on master.

[katspaugh]

@thijstriemstra is this blocked in some way?

A general note: I think the elan plugin and this segment plugin are both cool little apps in their own right, and they don't have to be plugins. They aren't really modifying wavesurfer.js in any way and can be built on top of it as regular apps.
Perhaps moving them to another repo would be a good idea.

[thijstriemstra]

is this blocked in some way?

yea; the actual work of bringing it back is blocking it ;)

Perhaps moving them to another repo would be a good idea.

fine with me.

[katspaugh]

yea; the actual work of bringing it back is blocking it ;)

Can you elaborate? Does the plugin code need to be updated because of the latest updates in wavesurfer.js?

If you're not planning to work on it, let's close the PR.

[thijstriemstra]

The plugin was removed in v2 or v3, can't remember exact version. Not sure why it was removed, I guess it was too much work to refactor the plugin for latest wavesurfer/es6, see #1092 (comment)

If you're not planning to work on it, let's close the PR.

Agreed.