Build 151208

• conemu#459: Characters disappear after readline Ctrl+R, …, Enter.
• ConEmu Inside: Fix detection of ‘ConEmu has focus’.
• ConEmu Inside: Don’t resize VCon or RCon if parent is minimized.
• ConEmu Inside: Show TaskBar progress on parent window.
• ConEmu Inside: Show flashing on parent window.
• Updater. Fight against wininet cache before downloading.
• In some cases ConEmu tried to set abnormally large console size.
• GuiMacro: GetInfo("ActivePID") returns PID of active console process or 0.