Add lang#actionscript layer (#3459)

autoload/SpaceVim/layers/lang/actionscript.vim

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+"=============================================================================
+" actionscript.vim --- actionscript support
+" Copyright (c) 2016-2019 Wang Shidong & Contributors
+" Author: Wang Shidong < wsdjeg@outlook.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+function! SpaceVim#layers#lang#actionscript#plugins() abort
+  let plugins = []
+  call add(plugins, ['wsdjeg/vim-actionscript', {'merged' : 0}])
+  return plugins
+endfunction

docs/cn/layers/lang/actionscript.md

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+---
+title: "SpaceVim lang#actionscript 模块"
+description: "这一模块为 actionscript 提供语法高亮"
+lang: zh
+---
+
+# [可用模块](../../) >> lang#actionscript
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [启用模块](#启用模块)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+这一模块为在 SpaceVim 中进行 actionscript 开发提供了支持。
+
+## 启用模块
+
+可通过在配置文件内加入如下配置来启用该模块：
+
+```toml
+[[layers]]
+  name = "lang#actionscript"
+```
+

docs/layers/lang/actionscript.md

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+---
+title: "SpaceVim lang#actionscript layer"
+description: "This layer is for actionscript syntax highlighting"
+---
+
+# [Available Layers](../../) >> lang#actionscript
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for actionscript development.
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#actionscript"
+```