[Feature] Autoload/widescreen support for Chex and HacX

[NightFright2k19]

Since Chex Quest (chex.wad, chex2.wad) and HacX 1.2 (hacx.wad) are very similar to Doom, it would be nice to have dedicated autoload and widescreen support for these games as well.

Notes:

• Chex won't work without Fraggle's chex.deh patch. Maybe it should be implemented somehow for easier setup
• Technically, chex2.wad is a PWAD for chex.wad and won't work without it. However, it has different level names which aren't covered by chex.deh. An adjusted dehacked file would have to be provided with just the level names changed, like so:

  
  Text 12 15
  E1M1: HangarE1M1: Spaceport

Text 19 12 E1M2: Nuclear PlantE1M2: Cinema

Text 20 17 E1M3: Toxin RefineryE1M3: Chex Museum

Text 21 18 E1M4: Command ControlE1M4: City Streets

Text 16 18 E1M5: Phobos LabE1M5: Sewer System

- Widescreen assets for all mentioned games can be taken from [Nash's WidePix project](https://github.com/nashmuhandes/WidePix)
- Widescreen statusbars (if needed) can be taken from the [Widescreen Statusbars project](https://github.com/NightFright2k19/doom_widehud)
- Autoload for both games should override any files set up in _autoload_global_ section (like doom2.wad)

[Dasperal]

@NightFright2k19 Autoload system was changed to the Directory based autoload. Can it help with Chex and HacX assets?