- Fix a few memory leaks found by oss-fuzz.
- Fix date and time conversion to string.
- Fix number conversion to string.
- Fix unit conversion.
- Handle more arrow styles.
- Fix some issues found by Coverity.
- Disable expanding entities by XML parser as a vulnerability prevention measure. Applications writing VSDX/VDX documents do not use entities, so there is no difference in behavior.
Signed-off-by: Pierre-Yves <firstname.lastname@example.org>