Cleanup
Client|UI: Adjusted task bar and console behavior

Based on feedback, Esc now opens just the menu. Shift-Esc will open
just the task bar (focusing the console command line). Shift-Esc will
then dismiss the taskbar+console completely, while a plain Esc will
first close the console and then another press will hide the task bar.
UI|All Games: Added "taskbar" cmd, replaced the Control Panel menu item

Instead of opening the control panel, the menu now has a "Show Taskbar"
item for showing the task bar. The control panel remains accessible
via the task bar by clicking on the DE logo.