Code Lens don't refresh after changing the setting

[Gama11]

When changing the "haxe.enableCodeLens" setting, code lens that are already active won't be refreshed until the file is edited.

This affects the new Toggle Code Lens command, but is technically not a new issue (same thing when manually editing the setting).

We need microsoft/language-server-protocol#192 to be resolved to be able to fix this.

[Gama11]

Looks like we can actually work around this by adding a second dummy provider in vshaxe to trigger the event. Got this idea from one of the referenced commits in the LSP issue:

dcastro/vscode-haskell-test-runner@ee08bd1

It's not pretty, but it works.