feat: added check_line for player win detection

src/window.cpp

@@ -5,7 +5,7 @@
 
 void Window::update_display(Tile (&tile_list)[9], Border (&border_list)[16]) {
 	for(std::array<char, COL> &row : m_board) { row.fill('.'); }
-	// Modify board
+
 	for(int i = 0; i < 9; i++) {
 		m_board[tile_list[i].m_pos.m_row][tile_list[i].m_pos.m_col] = tile_list[i].m_symbol;
 	}