ApplicationCore expects that each process variable that is writable from
the control-system is written once during initialization. This was
already ensured, but the way how it was done meant that this write might
happen with initial (zero) value instead of the restored value when
using Autosave.

This is improved now, so that when setting the PINI field of an output
record to YES, RUN, or RUNNING, a value that is restored through
Autosave will be the first value that is sent to the application.

In addition to that, ApplicationBase::optimiseUnmappedVariables is now
called with the set of process variables that is provided by the
application but not mapped to any EPICS records. This allows
ApplicationCore to skip updates for these PVs, improving performance.

All these changes only affect the use of the control-system adapter with
applications (through the ChimeraTK Control System Adapter). When
directly accessing a device through Device Access, these changes have no
effect.