OpenBVE v1.8.4.4

Significant Changes:

• Improve various small areas of the main menu under different conditions (Primarily mono oddities)- Thanks KennyHui
• Update zh-HK translation- KennyHui
• New: Allow drag + drop into the package install dialog.
• Fix: Object based backgrounds broken in GL3
• Fix: Handle an edge case where older Intel drivers report features they do not support.
• Fix: Better handling of untextured materials in default NewXParser.
• Fix: Improve rendering of HUD with non-default handle text.
• Fix: The ColorAll command did not apply to the final MeshBuilder in a file.