LibVT: Rename VT::BufferPosition to VT::Position and move to own file

Libraries/LibVT/Position.h

@@ -0,0 +1,48 @@
+#pragma once
+
+namespace VT {
+
+class Position {
+public:
+    Position() {}
+    Position(int row, int column)
+        : m_row(row)
+        , m_column(column)
+    {
+    }
+
+    bool is_valid() const { return m_row >= 0 && m_column >= 0; }
+    int row() const { return m_row; }
+    int column() const { return m_column; }
+
+    bool operator<(const Position& other) const
+    {
+        return m_row < other.m_row || (m_row == other.m_row && m_column < other.m_column);
+    }
+
+    bool operator<=(const Position& other) const
+    {
+        return *this < other || *this == other;
+    }
+
+    bool operator>=(const Position& other) const
+    {
+        return !(*this < other);
+    }
+
+    bool operator==(const Position& other) const
+    {
+        return m_row == other.m_row && m_column == other.m_column;
+    }
+
+    bool operator!=(const Position& other) const
+    {
+        return !(*this == other);
+    }
+
+private:
+    int m_row { -1 };
+    int m_column { -1 };
+};
+
+}