Forward-port donokuda/changes-polish

commit ea83090309637da404a38e27a8411bfc8fa82762
Add folder icon to the top

commit 73337ae5b5413df32577ea41c8ec73eedd2171ce
Make the text gray and strikethrough if deleted

commit 4290c09950e615867dd411a466b3f0656811ef22
Put a strike through the label of deleted files

commit d074887b9ea13bc1628a19750c5741cf72224aaa
Adjust more padding and spacing

commit a7e0a2aef09c85c7bec138d8e37688c821afa2ed
Add a little padding and margins in and around the commits area.

commit de5ed80f49f39d98fefbdf1169f06e4ea104431f
Add icon for untracked files

commit ca87c8941e8243d6fc320a35783d48053c4dd8e7
Adjust spacing in file tree

commit a52813e9f1b83c4d5850cca007032087e604d3b5
Render git icons on the file icon