Add G keybind to go to room

Ved has this useful feature where instead of having to manually travel
to a room whose coordinates you know, you can just press G and type in
coordinates to go there.

VCE added this, but I changed the text to be "x,y" instead of "(x,y)"
because otherwise it could confuse someone into thinking they need to
type parentheses when in reality they don't need to and typing them will
just make it not work.

Also I made sure to add an error message if the user types in an invalid
format. Failing silently would just confuse people, and maybe they'll
start thinking the feature doesn't work or something like that. VCE
doesn't have this helpful error message.

Lastly, VCE has a bug where if you use the shortcut to go from one
horizontally/vertically warping room to another, the background of the
previous room will still be there and scroll off with the background of
the room you went to, instead of just having the new background only.
This is because they forgot a 'graphics.backgrounddrawn = false;'. But
don't worry, *I* didn't forget about it.

desktop_version/src/editor.cpp

@@ -4295,6 +4295,20 @@ void editorinput()
             key.disabletextentry();
             switch (ed.textmod)
             {
+            case TEXT_GOTOROOM:
+            {
+                std::vector<std::string> coords = split(key.keybuffer, ',');
+                if (coords.size() != 2)
+                {
+                    ed.note = "[ ERROR: Invalid format ]";
+                    ed.notedelay = 45;
+                    break;
+                }
+                ed.levx = clamp(atoi(coords[0].c_str()) - 1, 0, ed.mapwidth - 1);
+                ed.levy = clamp(atoi(coords[1].c_str()) - 1, 0, ed.mapheight - 1);
+                graphics.backgrounddrawn = false;
+                break;
+            }
             case TEXT_LOAD:
             {
                 std::string loadstring = ed.filename + ".vvvvvv";
@@ -4692,6 +4706,12 @@ void editorinput()
                 ed.getlin(TEXT_ROOMNAME, "Enter new room name:", &(ed.level[ed.levx+(ed.levy*ed.maxwidth)].roomname));
                 game.mapheld=true;
             }
+            if (key.keymap[SDLK_g])
+            {
+                ed.keydelay = 6;
+                ed.getlin(TEXT_GOTOROOM, "Enter room coordinates x,y:", NULL);
+                game.mapheld=true;
+            }
 
             //Save and load
             if(key.keymap[SDLK_s])

desktop_version/src/editor.h

@@ -18,7 +18,8 @@ enum textmode {
   TEXT_ROOMNAME,
   TEXT_SCRIPT,
   TEXT_ROOMTEXT,
-  LAST_EDTEXT = TEXT_ROOMTEXT,
+  TEXT_GOTOROOM,
+  LAST_EDTEXT = TEXT_GOTOROOM,
 
   // Settings-mode text fields
   TEXT_TITLE,