Slided a bit the central point of the orange gradient to make it appear
only above 100% value.

added objects for 'force bold' and 'opacity'

Also implement correct run-time POSIX clock selection.

thanks for the explanation to courmisch

as we'll need seekpoints for UI: chapters offsets were not sufficient.

This lifts the PATH_MAX characters limit, and should fix encoding on
POSIX non-UTF-8 systems.