Build 180206 (alpha)

• conemu#1430: Toolbar buttons Min/Max/Close dissapears after toggling ‘Show buttons in tab bar’.
• conemu#1431: Lines were not erased properly from multiline xml entries (Environment variables, aliases, cp).
• conemu#1436: TitleBar was not painted properly if theming was disabled.
• conemu#1338: Error message was not displayed if 7-zip was not found.
• Write to log Theming and DWM flags.