Save textbox state, allow lang switches w/ textbox

This allows switching languages while a text box is on screen by saving
the necessary state for a text box to be retranslated when the language
is switched.

This saves the state of the position and direction of the crewmate that
the text box position is based off of (if applicable), and the text
case of the text box, the script name of the script, and the original
(English) lines of the text box. I did not explicitly label the original
lines as English lines except in a main game context, because
technically, custom levels could have original lines in a different
language.

Unfortunately, this doesn't work for every text box in the game.
Notably, the Level Complete, Game Complete, number of crewmates
remaining, trinket collection, Intermission 1 guides, etc. text boxes
are special and require further fixes, but that will be coming in later
commits.

desktop_version/src/Textbox.h

@@ -5,6 +5,25 @@
 #include <string>
 #include <vector>
 
+/* Position of the crewmate that the text box position is based off of.
+ * NOT a crewmate sprite inside the text box (that's a TextboxSprite). */
+struct TextboxCrewmatePosition
+{
+    bool override_x;
+    bool override_y;
+    int x;
+    int y;
+    int dir;
+    bool text_above;
+};
+
+struct TextboxOriginalContext
+{
+    std::vector<std::string> lines;
+    std::string script_name;
+    char text_case;
+};
+
 struct TextboxSprite
 {
     int x;
@@ -45,6 +64,8 @@ public:
 
     void resize(void);
 
+    void repositionfromcrewmate(void);
+
     void addline(const std::string& t);
 
     void pad(size_t left_pad, size_t right_pad);
@@ -52,6 +73,8 @@ public:
     void padtowidth(size_t new_w);
 
     void centertext(void);
+
+    void translate(void);
 public:
     //Fundamentals
     std::vector<std::string> lines;
@@ -76,6 +99,9 @@ public:
 
     std::vector<TextboxSprite> sprites;
     TextboxImage image;
+
+    TextboxCrewmatePosition crewmate_position;
+    TextboxOriginalContext original;
 };
 
 #endif /* TEXTBOX_H */