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Allows FURY compiled mapster32 to launch fury.exe

Outside of 3rd party libraries, remaining uses are the Polymer-specific
macro LIGHTRAD2 within Duke3D, system_15bit_rand and vox2poly.
Also use WRANDOM_MAX in SW.

Also add WRANDOM_MAX. This will be used in SW, preventing possible freezes.

Mesa conveys most of the useful info through there, not linking.

Followup to 67ef47dc.

Followup to 0f928a1f.

Followup to 072bd40e.

Disable with "osdclipboard 0".

Changes:
- Passing struct members and player vars as argument now works.
- If struct members are accessed without specifying the index,
  the command will display which index was used by the CON VM.
- Enable use of constant values for array indexing in addlogvar
- Enable logging of integer constants with addlogvar
- General refactoring and code improvement.

Duke3d: remove the extra flag passed to mouseLockToWindow() in GAME_onshowosd() that made it just show/hide the cursor instead of actually grabbing and ungrabbing input

Truth be told, I don't even remember why this hack was necessary. Let me know if anything breaks. Fixes #143.

These variables include:
* `tempxpanning`
* `tempypanning`
* `tempxvel`
* `tempyvel`
* `tempzvel`
* `tempstatnum`
* `tempblend`
* `tempsectnum`

Fixes #75 and #179.

Fixes #188