Optimize a line
Truncate tail in encoding list cell
Update appIcon (ref #148)
Merge branch 'refs/heads/feature/issue148_appIcon' into develop
Update changelog
Tweak application icon's dropshadow
Merge branch 'refs/heads/feature/issue148_appIcon' into develop
Draw line numbers with CoreText
Calculate line number only in visible range (ref #23)

for performance tuning
Merge branch 'refs/heads/feature/optimizeLineNumView' into develop
Fix types
Rename CELineNumView class to CELineNumberView

spell out
Create CELineHeightTransformer class (ref #177)

to convert line spacing <-> line height
Make line spacing setting UI line height based (close #177)

Also including the following changes:
- change line height field in preferences from combo box to normal text field + stepper
- change default line spacing from 0.0 to 0.3
- fix custom line height panel behavior
Merge branch 'refs/heads/feature/issue177_lineHeight' into develop
Fix changelog
Teak page guide opacity
Confirm to NSTextInputClient to handle vertical orientation easily
Scroll text view with arrow key line by line (close #21)
Fix async theme management (fix #176)