Liblouisutdml Release 2.9.0

This Liblouisutdml release fixes a couple of bugs and adds support for liblouis 3.15.

For a detailed list of all the changes refer to the list of closed issues.

• New features
• Bug fixes
• Other

New features

• Add support for liblouis 3.15

Bug fixes

• Fix a buffer overflow thanks to Samuel Thibault
• Fix a typo in make_makefile.c thanks to Arend Arends
• Fix a few bugs in the windows make file generator thanks to Christian Egli

Other

• Improvements to the help screen thanks to Sebastian Humenda
• Fix some math test cases thanks to Christian Egli