Fix Crash And Refine Tips

- Fix crash described in #164
- Upgrade unique-random-array to v2.0
- Refine tips to ts

Migrate EME to Typescript (#144)

* migrate_to_typescript

* refractor_common_js

* fix_build_break

* migrate_to_ts

* fix_babel_spread_error

* fix_typo

* fix_asar_error

* refine_code

* refractor_svg_icon_ts

* refine_wordcount

* fix_build_issue

use webpack-visualizer-plugin

bump version -> 0.12.0

use latest electron

remove gist in menu

tweak editor border width

fix typo

do not close tab if user aborted save action, fixed #38

add visualizer plugin