use new floating window api for hover (#1078)

* use new floating window api for hover

* rename type to ui

* fix lint issues

* add support for --ui=float|preview for LspHover

* add g:lsp_hover_ui

* always show below the cursor

* close on move

* fix when using empty g:lsp_hover_ui

* add hover preview support

* apply markdown for preview

* show top if available

* fix col position when far right

* silent deletebufline

* fix indent

* remove language

* set language

* fix normalize

* don't close if curpos hasn't changed

* if hover window is foused close

* add border

* add double tap support for floating LspHover window and lsp-hover-close plug

* fix indent

* fix lint issue

* fix grammar

* *ed

* remove echom register

* fix indent

* add lsp-hover-float and lsp-hover-preview plug

autoload/lsp.vim

@@ -29,6 +29,7 @@ augroup _lsp_silent_
     autocmd User lsp_complete_done silent
     autocmd User lsp_float_opened silent
     autocmd User lsp_float_closed silent
+    autocmd User lsp_float_focused silent
     autocmd User lsp_buffer_enabled silent
     autocmd User lsp_diagnostics_updated silent
     autocmd User lsp_progress_updated silent