Merge branch 'release/1.5.3' into develop
Increase version and clean changelog
Fix printing single page with header/footer (fix #139)

Conflicts:
	changelog.md
Fix auto-indent with full-width spaces (fix #142)
Fixed the file size update issue on file save

There was a bug where the file size display on status bar was not
updated when a file was saved. The users had to re-open the document in
order to update the file size display.

This patch fixes the issue by forcing status bar right text field to
update when a file size is updated. The performance impact of this
patch should be minimal.
Update changelog
Update version number
Update version history for v1.5.4
Fix text view setting update (fix #146)
Update version histories
Fix opacity update of line number view (#147)
Update version history
Fix large size file print with syntax coloring (fix #150)
Update version history
Merge branch 'release/1.5.4' into hotfix/1.5.4
update release date
Merge branch 'hotfix/1.5.4'