Change: Move OpenTTD version to intro viewport. (#14233)

This stops the length of the game version from affecting the main menu.

src/lang/english.txt

@@ -2195,7 +2195,8 @@ STR_VIDEO_DRIVER_ERROR_NO_HARDWARE_ACCELERATION                 :{WHITE}... no c
 STR_VIDEO_DRIVER_ERROR_HARDWARE_ACCELERATION_CRASH              :{WHITE}... GPU driver crashed the game. Hardware acceleration disabled
 
 # Intro window
-STR_INTRO_CAPTION                                               :{WHITE}OpenTTD {REV}
+STR_INTRO_CAPTION                                               :{WHITE}OpenTTD
+STR_INTRO_VERSION                                               :OpenTTD {REV}
 
 STR_INTRO_NEW_GAME                                              :{BLACK}New Game
 STR_INTRO_LOAD_GAME                                             :{BLACK}Load Game

src/main_gui.cpp

@@ -270,6 +270,9 @@ struct MainWindow : Window
 				DrawSprite(sprite, PAL_NONE, off_x, ScaleGUITrad(50));
 				off_x += GetSpriteSize(sprite).width + letter_spacing;
 			}
+
+			int text_y = this->height - GetCharacterHeight(FS_NORMAL) * 2;
+			DrawString(0, this->width - 1, text_y, STR_INTRO_VERSION, TC_WHITE, SA_CENTER);
 		}
 	}