Merge branch 'release/1.5.1' into develop
Update version and clean changelog
Append missing short cut for "Enter full Screen" action
Better autolayout constraints on preferences panes
Tweak setting & menu labels
Update help contents
Count words only when word count display is set

単語数を表示する設定にしていないときに単語数カウント処理をしないようにした
Fix an issue application crashes on copying sampleScript folder (fix #125)
Fix window position restore (fix #126)
Update version history
Make app more safety on the first launch
Update version number
Fix spaces on Japanese localization
Fix file drop
Fix file path format
Refactor file drop
Tweak version history
Modify a text in preferences
Apply more setting changes to current windows immediately
Add a blank line to version history