*: Add Markdown file documentation to //datadoc

:) Finally. Might as well.

datadoc/msh.md

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+# Europa Model Mesh (.msh)
+
+> [!WARNING]  
+> This document is mostly complete, however some pieces of it are not.
+
+Europa mesh files are used to store submodel data. They are referenced by .mdl files.
+
+# Magic/version
+
+Magic/version is indicated as 2 Windows (CR-LF) formatted lines:
+
+- `MESH\r\n`
+- `[version]\r\n`
+
+A file which does not start with the first line SHALL be rejected as a invalid .msh regardless of version.
+
+The following versions are known to exist:
+
+| Version | Description                                                                                                               |
+| ------- | ------------------------------------------------------------------------------------------------------------------------- |
+| 1.2     | Very early text format. Used by a grand total of one accidentally shipped(?) mesh (RESOURCE.PAK `model\default.msh`) file |
+| 2.0     | Binary format. Used by literally everything else                                                                          |
+
+# Version 1.2
+
+> [!CAUTION]
+> This format is currently not supported by libeuropa, since it can more than likely be imported by hand. Maybe for historic curiousity I'll document it later, but don't expect much.
+
+# Version 2.0
+
+### Block
+
+Mesh 2.0 files use a block structure for lists of information.
+
+A block consists of a 16-bit unsigned integer of count of items (not bytes!) in that block, then the serialized items themselves.
+
+A empty block will always be serialized as just `00 00` regardless of type.
+
+### Mesh piece
+
+A mesh piece is used to change material or potentionally to split a mesh if it exceeds 64k verts.
+
+In practice it's usually probably the first one.
+
+First the material name is read (until a new line character is read). This corresponds to a <!-- FIXME: Write doc --> .mtl material file the game will also parse.
+
+Next, the following blocks are read and parsed:
+
+- Vertex block. This block corresponds of Vec3s (your usual float x, float y, float z deal) which repressent each vertex.
+- Vertex color block. Consists of a struct of rgba colors for each vertex.
+- Normal block. Consists of Vec3s which define normal. May possibly not be pressent (normals probably have to be generated then.)
+- UV block. This consists of a set of UV coordinates over all verticies (and there can be multiple UVs, but I haven't fully worked this out..)
+- Face block. This consists of 3 uint16 face indicies for XYZ for each vertex.
+
+In version 2.0, the mesh file consists of a block of mesh pieces, except there will be at least one in a valid mesh file.

datadoc/pak.md

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+# Europa Package Files (.PAK)
+
+> [!WARNING]  
+> This document is incomplete and needs more details.
+
+Package files are used by the Europa engine's core filesystem APIs to boost file performance.
+
+## Versions
+
+| Version | Estimated dates                                                           |
+| ------- | ------------------------------------------------------------------------- |
+| 3       | ? - July 2000. Seen in very early PMDL exports only                       |
+| 4       | August 2000 - Feburary 2001 (Used for packages built closer to ship date) |
+| 5       | Sometime 2001 - March 2002 (Used for Jedi Starfighter)                    |
+
+Versions 3 and 4 are relatively similar, with only minor differences.

datadoc/tex.md

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+# Europa PS2 Texture File (.tex)
+
+On PS2, the Europa engine uses a homebrew texture format, known as "YATF" or, ~~probably~~ definitely **Y**et **A**nother **T**exture **F**ormat. Glad to know this team had some humour to them.
+
+# Versions
+
+| Version | Details                                                                                                          |
+| ------- | ---------------------------------------------------------------------------------------------------------------- |
+| 1       | Introduced in Starfighter.                                                                                       |
+| 2       | Introduced in Jedi Starfighter. Breaks the FourCC magic and adds a 4bpp mode while jumbling all the other modes. |
+
+# Header
+
+The .tex file header is one of the few filetypes in Europa which uses a proper FourCC magic. However this becomes rapidly annoying as you'll see later.
+
+```cpp
+struct yatfHeader {
+    uint32_t magic;
+    uint16_t version;
+    Format format; // Version-specific
+    uint8_t unknown; // ?
+    uint32_t unknownZeroed; // Zeroed on all files
+
+    uint32_t width;
+    uint32_t height;
+};
+```
+
+### Version 1
+
+Version 1 writes its magic (in LE) as `FTAY`.
+
+Version 1 formats are:
+
+| Int | Format type            |
+| --- | ---------------------- |
+| 0   | 8bpp CLUT (256 colors) |
+| 2   | 24bpp direct color     |
+| 3   | 32bpp RGBA8888         |
+
+### Version 2
+
+Version 2 writes its magic (in LE) as `YATF`. I have no clue why they did this because it pretty much means they broke the format anyways.
+
+Version 2 formats are:
+
+| Int | Format type            |
+| --- | ---------------------- |
+| 1   | 8bpp CLUT (256 colors) |
+| 3   | 24bpp direct color     |
+| 4   | 32bpp RGBA8888         |
+| 5   | 4bpp CLUT (16 colors)  |