Facilitates merging of ServerFont and FreetypeServerFont

This fixes n#707779 - previously, with larger number format
AbsLSpace, LRSpace's left indent could easily become negative -
which the EditEngine does not like at all & exhibits repaint
errors.

There are still some link warnings left, though.

Preserves the  CollateSingleJobs between calls to print dialog

according cppchecker, small cleaning

* write [#REF!] to ODFF when any part of the reference is invalid
* read [#REF!] as reference error
* display #REF! in UI
+ parse #REF! in UI
+ implemented error constants defined in ODFF as error tokens
+ parse error constants from ODFF and in UI
* fixed SUM, AVERAGE, SUMSQ, PRODUCT to propagate error

Unlikely to work yet, but at least builds for the simulator.

We can not use dynamic code generation on iOS, so we use a fixed set
of code snippets, genertated by a Perl script. Experimentation seems
to indicate that a relatively small set of static code snippets should
be enough in simple use cases with no extensions (that we can't really
support on iOS anyway) and stuff.

Except for the static set of snippets the code mostly is, or will be,
an ifdefified combination of the gcc3_linux_arm and gcc3_macosx_intel
code. The ABI on iOS ARM devices should be quite close to that on
Linux ARM, knock on wood.