Make statusbar more compact

The current statusbar is too big in height taking more space than strictly necessary. In an editor application, the editor should take maximum available space. To achieve this, following changes are made:

• No spacing between elements
• Use smaller margins

One additional change is to hide the "modified" icon by default and only show it if the document has some changes. The reason for this is it is only useful to make it visible when the document is modified. In the non-modified case it does nothing and actually causes confusion about the purpose of this button.

before

after