THPDFJobProcessor.Execute
Runs a complete file-job described in JSON text and returns the results as JSON
class function Execute(const JobJSON: AnsiString): AnsiString; static;
The unit is HPDFDocJobs; the job text is capped at 4 MiB and its operations array at 1024 entries
Each element of the operations array is dispatched to ExecuteOperation, and the returned document gathers one result object per operation
An empty or non-object job is treated as an empty operation list