Move updatenotifications to unified webpack

[rullzer]

Signed-off-by: Roeland Jago Douma roeland@famdouma.nl

[juliusknorr]

@rullzer I've pushed better a fix for the hot reload issue, which causes differences in the bundled files. The actual issue is that webpack doesn't set the NODE_ENV variable when setting the mode to 'production' so vue-loader was still behaving as if it was in development mode. (https://github.com/webpack/webpack/issues/7074) Setting the environment variable as well seems to fix that: b6335e9

[skjnldsv]

@juliushaertl does this impact the bundle size ? Shall we edit all of our configs?

[rullzer]

@juliushaertl nice catch. Lets fix this in a seperate PR so we keep it clean. See #14258

[juliusknorr]

@juliushaertl does this impact the bundle size ? Shall we edit all of our configs?

I didn't found any huge difference, for the server bundles it was like <1kb less.

[rullzer]

Rebased. Ready to get in!