Pdfviewer: generate isAFoo() and getAsFoo() api for fields that can have multiple types.

experimental/PdfViewer/PdfReference-okular-1.txt

Index: experimental/PdfViewer/PdfReference-okular-1.txt
===================================================================
--- experimental/PdfViewer/PdfReference-okular-1.txt	(revision 9644)
+++ experimental/PdfViewer/PdfReference-okular-1.txt	(working copy)
@@ -2137,8 +2137,8 @@
     Except where noted otherwise, all values supplied to the decoding filter by any of
     these parameters must match those used when the data was encoded.
                  TABLE 3.9 Optional parameters for the CCITTFaxDecode filter
-KEY                                     TYPE                                                        VALUE
-K                                       integer                                                     ()A code identifying the encoding scheme used:
+KEY                                         TYPE                                                    VALUE
+K                                           integer                                                 ()A code identifying the encoding scheme used:
                                                                                                       <0    Pure two-dimensional encoding (Group 4)
                                                                                                         0   Pure one-dimensional encoding (Group 3, 1-D)
                                                                                                       >0    Mixed one- and two-dimensional encoding (Group 3,