data: add some extra default stuff

MarathonData.md

@@ -957,7 +957,7 @@ Static Map Info is 88 bytes.
 
 | Name           | Type       | Offset |
 | ----           | ----       | ------ |
-| `EnvCode`      | `u16`      | `0`    |
+| `TextureId`    | `u16`      | `0`    |
 | `PhysicsId`    | `u16`      | `2`    |
 | `LandscapeId`  | `u16`      | `4`    |
 | `MissionFlags` | `u16`      | `6`    |
@@ -965,16 +965,16 @@ Static Map Info is 88 bytes.
 | `Name`         | `u8[66]`   | `18`   |
 | `EntryFlags`   | `u32`      | `84`   |
 
-- `EnvCode` is a preset number for texture collections and some other things
-such as media (liquid) presets.
+- `TextureId` is a Texture Collection enumeration. It is a preset number for texture collections and some other things such as media (liquid) presets.
 - `PhysicsId` used to be used for specifying three physics models: one for the
 Forge editor, one for the game, and one for low-gravity. However, the first one
 ended up being useless and the third was made into a map flag instead which
 simply modifies the current physics model. This should always be set to `1` by
 new editors.
-- `LandscapeId` is the landscape number to use for the sky. This starts at `0`,
-since it's an offset into the landscape collections. If `DataVersion` is
-`DataM1`, then this is used as the music index instead.
+- `LandscapeId` is a Landscape enumeration. is the landscape number to use for
+the sky. This starts at `0`, since it's an offset into the landscape
+collections. If `DataVersion` is `DataM1` or the `Music` flag of `EnvFlags` is
+set, then this is used as the music index instead.
 - `MissionFlags` is a Mission Flags bit field.
 - `EnvFlags` is an Environment Flags bit field.
 - `Name` is the level name, intended to be 65 bytes, but one padding byte is
@@ -2001,6 +2001,30 @@ unobstructed.
 | `Lava`         | `1`   |
 | `Goo`          | `2`   |
 | `Sewage`       | `3`   |
+| `Jjaro`        | `4`   |
+
+### Texture Collection ###
+
+| Name     | Value |
+| ----     | ----- |
+| `Water`  | `0`   |
+| `Lava`   | `1`   |
+| `Sewage` | `2`   |
+| `Jjaro`  | `3`   |
+| `Pfhor`  | `4`   |
+
+These are the default texture sets.
+
+### Landscape ###
+
+| Name          | Value |
+| ----          | ----- |
+| `LhowonDay`   | `0`   |
+| `LhowonNight` | `1`   |
+| `Moon`        | `2`   |
+| `Space`       | `3`   |
+
+These are the default landscapes.
 
 ### Platform Type ###