+ Added MDL3.gui: mods can draw panels, text, shapes and images on screen, with no other dependency
+ Added argument checks for MDL3.gui: a wrong call reports an error instead of crashing the game
+ Added automatic cleanup: a mod's drawings are removed when it is disabled or reloaded
+ Added gui_assets.py: converts PNG images for use in mods
+ Added audio controls: pause, resume, stop, loop, pitch and volume per sound
+ Added 3D positional audio: sounds follow a position or unit, with distance falloff and Doppler
+ Added reverb with 14 preset environments plus custom settings (max 3 different reverbs at once across all mods)
+ Updated bundled HD2 Data Hub from 0.3.0 to 0.6.0: backpack state, boosters, status effects, lobby info
+ Updated For Modder docs: Data Hub 0.6.0 reference, audio guide, GUI guide
+ Fixed the game freezing ("Not Responding") at the diagnostic window when EAC blocks MDL3
+ Changed the diagnostic window to no longer check certificates automatically; the EAC Fix Kit is recommended instead
+ Improved diagnostic logs: each step is saved before it runs, to help find hangs
