dialogplus DialogPlus 2.0 draft

Finally I have some time to improve this library. Since there was a huge break for this library, I'll collect major/minor issues under this one as tasks, the way I handled Hawk and Logger previously. I'll go through all open issues, but feel free to mention them.

[ ] Update all dependencies
[ ] Add support annotations, especially Nullable and NonNullable
[ ] Allow non-scrollable fixed header and footer
[ ] Provide an API to disable setting click listeners recursively.
[ ] Move content holder related methods to each holder

val dialog = DialogPlusBuilder()
    contentHolder = ListHolder.Builder(adapter)
         .setHeader(header, fixed)   // fixed -> boolean value to keep header at top
         .setFooter(footer, fixed)   // fixed -> boolean value to keep footer at bottom
         .setItemClickListener( dialog,item,view,position -> {
               // item
         })
}.build()

[ ] Provide RecyclerViewHolder

val dialog = DialogPlusBuilder()
    contentHolder = RecyclerViewHolder.Builder(adapter)
         .setLayoutManager(gridLayoutManager)  // optional, as default it'll be LinearLayoutManager
         .setHeader(header, fixed)   // fixed -> boolean value to keep header at top
         .setFooter(footer, fixed)   // fixed -> boolean value to keep footer at bottom
         .setItemClickListener( dialog,item,view,position -> {
               // item
         })
}.build()