Merge branch 'ml/themes'

* ml/themes: gitk: set minimum size on configuration dialog gitk: separate code blocks for configuration dialog gitk: make configuration dialog resizing useful gitk: add theme selection to color configuration page gitk: add proc run_themeloader gitk: eliminate unused ui color variables gitk: eliminate Interface color option from gui gitk: use text labels for next/prev search buttons gitk: use text labels for commit ID buttons gitk: do not invoke tk_setPalette gitk: use config variables to define and load a theme gitk: make sha1but a ttk::button gitk: use themed spinboxes Signed-off-by: Johannes Sixt <j6t@kdbg.org>