otoca: add cam hook, fix printer rotation (#573)

## Link to GitHub Issue or related Pull Request, if one exists
related to #154 though this PR doesn't fix it

## Description of change

1. Add an option for cam hook so that the game can be launched without
any camera
1. Rotate image printed out by print-to-file so that it's right side up
(portrait orientation)

## Testing
Able to boot the game without any cameras, and tested printing in test
menu.

"Holo" printing remains broken.

src/spice2x/games/otoca/io.cpp

@@ -23,6 +23,11 @@ std::vector<Button> &games::otoca::get_buttons() {
     return buttons;
 }
 
+std::string games::otoca::get_buttons_help() {
+    // keep to max 100 characters wide
+    return "    BT_Left   Lever   BT_Right";
+}
+
 std::vector<Light> &games::otoca::get_lights() {
     static std::vector<Light> lights;