move jquery and jquery-migrate to npm/webpack

[silverwind]

Currently, this needs to be its own chunk because fomantic depends on jQuery being present. The next step is to move fomantic to webpack too after which we can combine the index,fomantic and jquery files into one.

jquery-migrate is still neccessary because our ancient version of Dropzone seems to break without it. I imagine it can be removed after a Dropzone upgrade.

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  Hits              ?    33561           
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[silverwind]

Regarding future interaction between jQuery and fomantic: Problem is jQuery does not set globals when loaded via webpack but they must be present for fomantic to load correctly. I imagine some experimenting with one of these might get it to work, but it will be a bit tricky:

• https://github.com/webpack-contrib/expose-loader
• https://webpack.js.org/plugins/provide-plugin/

[silverwind]

I think I might opt to use copy-webpack-plugin for jQuery to deal with the future fomantic situation, so this should be considered WIP for now.

[lafriks]

I think better currently leave as it is now, and when moving fomantic than we can think about copy-webpack-plugin

[silverwind]

Agree, that can be done later, so this should be good to merge for now.

[silverwind]

Rebased and included a tweak to webpack which eliminates asset size warnings currently present on master.

This is good to go from my side. Any reviews?

[lunny]

Please resolve the conflicts.

[silverwind]

Rebased and squashed.