Add displaying static title and elapsed time, duration

[nonoo]

This pull request contains the following additions:

• A static title which is displayed at the bottom of the screen. It can be enabled and set with a command line argument, or with a D-BUS call. While a static title is displayed, the subtitle is padded slightly upwards. The title can be toggled, shown or hidden using D-BUS calls or key bindings. The alignment of the title can be adjusted between left and center (default: left) using a command line argument.
• The elapsed time and duration can be displayed at the bottom right of the screen. It can be enabled with a command line argument, or with a D-BUS call. The time display can be toggled, shown or hidden using D-BUS calls or key bindings.

Both the static title and time display uses the same font which can be set using a command line argument. The font size can also be set. This font is independent of the subtitle font.

[bluss]

Now it doesn't seem like anything's getting merged (is there an active fork?) This is very useful, but taking 6 keys in the keymap is not so economical.

[captain]

This is the ONLY place I've been able to find ANY mention of the heretofore feature of displaying elapsed/total time during pause in omxplayer. This seems to have vanished at some point circa 2020-dec. I sure would like to get this feature back. Please contact me if you know what happened and/or how to fix/restore it.