Now uses Core QT css.
Ticket #23318 - Update Houdini engine for PyQt support.
Updated PyQt compatibility
Ticket #23983 - Fixes to let the engine startup when Houdini is run without a ui.
Fix for using PyQt on linux.
Ticket #23459 - Add support for python 2.7 (now the default for Houdini 13).
Merge pull request #3 from shotgunsoftware/23459_hou13_support

Ticket #23459 - Add support for python 2.7 (now the default for Houdini 13)
Create software_credits
#25382 - Updated PySide version handling to support very old versions!
Fixed typo!
#25647 #25432 Switched to the new dark theme. Better thread protection.

Switches the houdini engine to use the new dark theme introduced in 
https://github.com/shotgunsoftware/tk-core/pull/80

Also adds protection so that you cannot launch UIs from a non-UI thread.
This is a particular problem on Houdini where the python shell runs in a
separate thread, meaning that if you try to launch any QT UI from the
python console, it is likely to lead to instability or crashes.
Merge branch 'master' into tankqdialog_closeevent

Conflicts:
	engine.py
	info.yml