Implement -skill and -warp

[Olga Orlova-Alley]

When creating new maps for the game, testing them in ecwolf is a pain (it also is a pain in the official wolf3d binary, but I don't really think we need to keep it that way). First, you have to sit through a bunch of loading splashscreens, then you have to start the game, enter the debug mode and warp to the desired level... In short, it takes quite a while to even get to the desired level, and when iterating through multiple versions of a map, you'd rather be able to quickly launch the game, test your changes and exit.

ZDoom handles this with two command line arguments: -skill and -warp. For example, you could start zdoom.exe as zdoom -warp 02 -skill 4 to immediately start the second map on the Ultra-Violence difficulty, without any splash screens or menus. Suggest implementing these arguments for ECWolf as well, to simlify map testing.

[Braden Obrzut]

Actually even vanilla has these. Warp is --tedlevel (named after the TED map editor), the skill level is --baby, --easy, --normal, and --hard. (Vanilla doesn't have any dashes, wolf4sdl added those.)

As an extension ECWolf can take the map label as the argument to tedlevel instead of the map number. So --tedlevel map02 --hard.

You can also speed things up with the --nowait switch.

[Olga Orlova-Alley]

Oh, interesting -- I had absolutely no clue! Thanks for pointing this out. I think we might benefit from a wiki page describing these command line arguments, then.

[Braden Obrzut]

Addressed in changeset fe83d8b since --skill would be useful for mods with more than 4 skill levels.