UDMF features from latest DSDA release

[Graf Zahl]

I am putting this here in case someone interested can claim one of these features to implement. I'll take some of these features myself when I find some time, but if someone else is interested, please be my guest and help out!
Most of these additions should be trivial to do and map to already existing features. The only new thing would be more fine grained control of what actors to apply thrust to.

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### Sectors

| Property | Description |
| --- | --- |
|  xthrust _float_ | X thrust magnitude (map units per frame^2). |
|  ythrust _float_ | Y thrust magnitude (map units per frame^2). |
|  thrustgroup _integer_ | Thrust group (see table below). |
|  thrustlocation _integer_ | Thrust location (see table below). |

#### Thrust Group

| Flag | Meaning                  |
| ---- | ------------------------ |
| 1    | Affect static objects    |
| 2    | Affect players           |
| 4    | Affect monsters          |
| 8    | Affect projectiles       |
| 16   | Affect WINDTHRUST actors |

#### Thrust Location

| Flag | Meaning                |
| ---- | ---------------------- |
| 1    | Affect grounded actors |
| 2    | Affect airborne actors |
| 4    | Affect ceiling actors  |

[Graf Zahl]

There's also these two action specials:

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### New Line Specials

**2701: Map_SetColormap(colormap)**
Sets the map colormap.
- _colormap_: the colormap (string argument).

**2702: Sector_SetColormap(colormap, tag)**
Sets the colormap for tagged sectors.
- _colormap_: the colormap (string argument).
- _tag_: The tag of the sector(s) to affect.