Add YATF ImHex pattern and add libpixel submodule

.gitmodules

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+[submodule "third_party/libpixel"]
+	path = third_party/libpixel
+	url = https://github.com/modeco80/libpixel.git

hexpat/pak.hexpat

@@ -1,3 +1,10 @@
+//
+// EuropaTools
+//
+// (C) 2021-2022 modeco80 <lily.modeco80@protonmail.ch>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
 
 #pragma endian little
 

hexpat/yatf.hexpat

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+//
+// EuropaTools
+//
+// (C) 2021-2022 modeco80 <lily.modeco80@protonmail.ch>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+
+// YATF pattern
+
+#include <std/io.pat>
+#pragma endian little
+
+namespace europa {
+
+	// YATF header.
+	struct TexHeader {
+		char magic[4]; // 'YATF'
+		
+		// Flag descriptions:
+		//
+		// 0x1       - unknown? (always pressent)
+		// 0x30000   - direct color (no palette)
+		// 0x1000000 - uses alpha
+		u32 flags;
+		
+		// Always zeroed.
+		u32 zero;
+		
+		// these are swapped backwards
+		// for some reason.
+		u32 height;
+		u32 width;
+	};
+	
+	// A YATF file.
+	struct TexFile {
+		TexHeader header;
+		
+		if(header.flags & 0x1000000) {
+			std::print("[YATF] this YATF uses alpha?");
+		}
+		
+		if(!(header.flags & 0x30000)) {
+			std::print("[YATF] this YATF is palettized");
+			
+			u32 palette[256];
+			u8 bitmap[header.width * header.height];
+		} else {
+			std::print("[YATF] this YATF is direct color");
+			
+			u32 bitmap[header.width * header.height];
+		}
+	};
+
+} // namespace europa
+
+
+europa::TexFile tex @ 0x0;

third_party/libpixel

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+Subproject commit e7be1115575317e9b80c5c1be04fa2e950badb97