- moved console command line buffer tab completion into their own files.

- layout fixes in load/save menu and confirmation screen.

src/common/console/c_commandbuffer.h

@@ -0,0 +1,63 @@
+#include <string>
+#include "zstring.h"
+
+struct FCommandBuffer
+{
+private:
+	std::u32string Text;
+	unsigned CursorPos = 0;
+	unsigned StartPos = 0;	// First character to display
+	unsigned CursorPosCells = 0;
+	unsigned StartPosCells = 0;
+
+	std::u32string YankBuffer;	// Deleted text buffer
+
+public:
+	bool AppendToYankBuffer = false;	// Append consecutive deletes to buffer
+	int ConCols;
+
+	FCommandBuffer() = default;
+
+	FCommandBuffer(const FCommandBuffer &o);
+	FString GetText() const;
+
+	size_t TextLength() const
+	{
+		return Text.length();
+	}
+
+	void Draw(int x, int y, int scale, bool cursor);
+	unsigned CalcCellSize(unsigned length);
+	unsigned CharsForCells(unsigned cellin, bool *overflow);
+	void MakeStartPosGood();;
+	void CursorStart();
+	void CursorEnd();
+
+private:
+	void MoveCursorLeft()
+	{
+		CursorPos--;
+	}
+
+	void MoveCursorRight()
+	{
+		CursorPos++;
+	}
+
+public:
+	void CursorLeft();
+	void CursorRight();
+	void CursorWordLeft();
+	void CursorWordRight();
+	void DeleteLeft();
+	void DeleteRight();
+	void DeleteWordLeft();
+	void DeleteLineLeft();
+	void DeleteLineRight();
+	void AddChar(int character);
+	void AddString(FString clip);
+	void SetString(const FString &str);
+	void AddYankBuffer();
+};
+
+extern FCommandBuffer CmdLine;