v0.2.3

Loads of Bugfixes

• Made x file importing optional
• Added Blender 2.79 compat for matrix multiplications (fixes #35)
• Fixed some bugs with the x file importer selection behaviour
• Fixed issue #38 with the spline importer
• Added support for spline profiles with more than two points
• Added Blender 2.79 compat to the log statement in io_omsi_tile.py
• Removed some unnecessary code
• Added tessface based mesh exporter for Blender 2.79
• Added proper o3d material export compatibility for 2.79
• o3d material importer now imports specular colour and emission
• Added 2.79 compat for select_set() in various places
• Replaced f strings for compat with 2.79
• Added specular colour import to o3dconvert.py
• Refactoring