Replace lodash with homemade functions

[Aareksio]

I'm not particularly happy of the Tippy + Popper bundle being whopping 32kB and this wrapper package adding 47kB is a joke.

PR demonstrates how you could reduce it's size by replacing lodash.<module> dependencies with functions crafted to your needs. It's still enormous, but the change shoved off roughly 20kB. If such replacement is no-no, consider at least replacing lodash.<module> with lodash-es, as mapValues and pickBy overlaps and lodash-es is more likely an existing dependency of final app than lodash.<module>.

For anyone willing to use it now in their webpack process (works for me, no test included / passed):
npm i Aareksio/vue-tippy#fix-module-size

import VueTippy, { TippyComponent } from 'vue-tippy/src/index';

Vue.use(VueTippy);
Vue.component("tippy", TippyComponent);