Add tools#dash layer (#1366)

Add tools#dash layer to integrate with Dash.

autoload/SpaceVim/layers/tools/dash.vim

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+"=============================================================================
+" dash.vim --- tools#dash layer file for SpaceVim
+" Copyright (c) 2018 Shidong Wang & Contributors
+" Author: Seong Yong-ju < sei40kr at gmail.com >
+" URL: https://spacevim.org
+" License: MIT license
+"=============================================================================
+
+""
+" @section tools#dash, layer-tools-dash
+" @parentsection layers
+" This layer provides Dash integration for SpaceVim
+
+function! SpaceVim#layers#tools#dash#plugins() abort
+  return [
+        \ ['rizzatti/dash.vim', {
+        \ 'on_map': { 'n': ['<Plug>DashSearch', '<Plug>DashGlobalSearch'] }
+        \ }],
+        \ ]
+endfunction
+
+function! SpaceVim#layers#tools#dash#config() abort
+  "" rizzatti/dash.vim {{{
+  " Allows configuration of mappings between Vim filetypes and Dash's docsets.
+  let g:dash_map = extend({
+        \ 'java': ['java', 'android', 'javafx', 'spring', 'javadoc'],
+        \ }, get(g:, 'dash_map', {}))
+  "" }}}
+
+  let g:_spacevim_mappings_space.D = { 'name' : '+Dash' }
+  call SpaceVim#mapping#space#def('nmap', ['D', 'd'],
+        \ '<Plug>DashSearch', 'search word under cursor', 0)
+  call SpaceVim#mapping#space#def('nmap', ['D', 'D'],
+        \ '<Plug>DashGlobalSearch', 'search word under cursor in all docs', 0)
+endfunction

docs/layers/tools/dash.md

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+---
+title: "SpaceVim dash layer"
+description: "This layer provides Dash integration for SpaceVim"
+---
+
+# [SpaceVim Layers:](https://spacevim.org/layers) tools#dash
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Layer Installation](#layer-installation)
+- [Key bindings](#key-bindings)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer provides Dash integration for SpaceVim.
+
+## Layer Installation
+
+To use this configuration layer, add it to your `~/.SpaceVim.d/init.vim`.
+
+```vim
+call SpaceVim#layers#load('tools#dash')
+```
+
+## Key bindings
+
+| Key Binding | Description                          |
+| ----------- | ------------------------------------ |
+| `SPC D d`   | search word under cursor             |
+| `SPC D D`   | search word under cursor in all docs |