COM_Rand() fix cast

Changed version back to 1.31.3 for an ultimate 1.31 bugfix

Dockerfile : update SDL version to 2.30.8

Fix Powershell NSI script now using quakever.h

Add mssing bits in ED_Alloc

Fix file handle leak in Image_LoadImage (#320)

(introduced in a0f0f69aa2be066c1cb8bfd5006e49723e4e701a)

Fix manual entry for Quake dirs not working in NSI installer

Draw keys in modern HUD

Bump version to 1.22.3

Fullscreen mouse cursor