add dict support

[yehuohan]

add dict support for motion target with simplified chinese text and traditional chinese text.

[VimWei]

Can g:EasyMotion_dict use multi-dict?

My document mix-up is in several languages, including simplified Chinese, traditional Chinese, and English.

[VimWei]

我测试了一下，反馈两个可以改进的地方：
I tested it and reported two areas for improvement:

1. 在输入检索内容时，目前还不能像英文那样实时加亮候选项目。
   When I enter the retrieved content, it can not highlight the candidate items in real time but it can in English.

2. 不能中英文混合查询，只能纯粹英文，或纯粹中文。建议在字典中加入26个英文字母对自身的映射（包括大小写）即可解决。
   It can't mix Chinese and English query, but only pure English, or pure Chinese. It is recommended that the English alphabet be mapped to its own lowercase and uppercase. For example, map a to a and A.

[VimWei]

再反馈一个问题：
Here’s another feedback:

1. 不能检索超出屏幕范围的中文：我使用 nmap f (easymotion-sn) 可以检索超出屏幕范围的英文，但无法检索超出屏幕范围的中文。

Unable to retrieve out-of-screen Chinese: I can retrieve out-of-screen English using nmap f (easymotion-sn) , but not out-of-screen Chinese.

[yehuohan]

Sorry for that I had only code and debug with (easymotion-overwin-f).
There are issues with (easymotion-sn) and I need sometime to debug it.

[yehuohan]

@VimWei (easymotion-sn) use incsearch feature to highlight input and I think it's not suitable time to replace inputed pattern with dict text.