Addition of OpenSymbol2

Remaining lines have been uploaded via amend.
The other day was discussed in the IRC chat if OpenSymbol was actually removable. The actual problem with open symbol is that there are too many characters missing characters and it supposes a ballast for starmath.
This responds to: Bug tdf#134214
Some of the problems caused by this are WON'T FIX: mathhbb, fractur, setp tdf#49990 and much more.
However replacing the font was actually impossible. If changed the layouts old documents may break. For that reason the new font had to support what already was implemented in a way it won't change the layout: the old symbols had to be conservated.
Result: we are creating a new font, containing opensymbol just for personal use of starmath module.
For now the changes with opensymbol are:
- Reencoded as ISO 10466-1 ( unicode32 full ) with fontforge.
- Added quadruple integral with fontforge.
- Do not use it outside starmath. Changes will be made in private chars area. IT MAY BREAK.
In order to complete it, characters from anothers fonts will be added. For now the best option is libertinus math. This font final name might end beeing something like LO Libertinus math.
I have already contacted the maintainer in order to get permission and waiting for answer. In case of no will look for other fonts.
The other option would be to make opensymbol2 a subproduct of libertinus because:

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.

Change-Id: Ia33a0181b0d28b65680d8df9ffa3d0c37078df18
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/105769
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

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