build!: remove 32-bit Windows build

[keturn]

I think Terasology dropped 32-bit support a while back.

[skaldarnar]

Oh, there are more left-overs we can remove now.

• https://github.com/MovingBlocks/TerasologyLauncher/tree/master/buildres/windows32 (963a9e0)
• asset-upload workflow (c6491fb)
• check max heap size in settings validation:

  TerasologyLauncher/src/main/java/org/terasology/launcher/settings/LauncherSettingsValidator.java

  Lines 26 to 31 in f0757ad

  	// Rule for max heap size
  	new SettingsValidationRule(
  	s -> !(System.getProperty("os.arch").equals("x86") && s.maxHeapSize.get().compareTo(JavaHeapSize.GB_1_5) > 0),
  	"Max heap size cannot be greater than 1.5 GB for a 32-bit JVM",
  	s -> s.maxHeapSize.set(JavaHeapSize.GB_1_5)
  	),

• another place where we bother about heap sizes:

  TerasologyLauncher/src/main/java/org/terasology/launcher/ui/SettingsController.java

  Lines 272 to 275 in b449d27

  	// Limit items till 1.5 GB for 32-bit JVM
  	final JavaHeapSize[] heapSizeRange = System.getProperty("os.arch").equals("x86")
  	? Arrays.copyOfRange(JavaHeapSize.values(), 0, JavaHeapSize.GB_1_5.ordinal() + 1)
  	: JavaHeapSize.values();

[skaldarnar]

Let's also clean up the other places where we still have remains about 32 bit architectures...