#45 FTGL segfaults when rendering an unicode string containing characters located outside the Basic Multilingual Plane

v1.0 (example)
open
nobody
None
5
2014-08-12
2014-08-12
Lambert Antoine
No

When providing an unicode string to render containing characters located outside the Basic Multilingual Plane (codepoints > U+FFFF), FTGL generates a segmentation fault.

The attached patch fixed that issue by supporting all Unicode planes in the FTCharmap class.

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