add options for "Filename_schema" in "Diagnostic Presets"

This appears to be hard-coded in the app. Later it must be configurable.

Usual option from LaserLightInspector is _YYYY-MM-DD_HHh-MMm-SSs_COUNTER_original.png. Another option is that "_original" is not there, hence it is a processed image. File types can change in principle.

For pco software the schema is _COUNTER.tif.