Transitions: per-trigger targets and 3D wireframe; FOV range fixes

- Each changelevel trigger now shows its own target map. The trigger whose
  target is the map we came from is marked "<- map"; the forward one is
  "-> map". No more appending one global previous-map line to every box.
- Draw the volume as a projected 8-corner / 12-edge wireframe with the tag
  above its highest visible corner instead of a screen-space rectangle.
- Camera FOV is 40..140 (stock 75) and viewmodel FOV 20..120 (stock 54); 0 is
  no longer allowed and old configs using 0 migrate to the stock value.
- Log the mat_monitorgamma readback via ICvar so we can tell whether the
  command is rejected or the OS/compositor ignores the gamma ramp.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/gui.cpp b/src/gui.cpp
index 974347a..88e5521 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -413,11 +413,11 @@ static void build_cards() {
   int view = add_card(2, nullptr, "Camera / display",
                       "Camera FOV, viewmodel FOV and monitor gamma.", true);
   add_slider(view, "Camera FOV",
-             "World camera field of view; 0 keeps the game default (75).", 0,
-             140, &g_fov_camera);
+             "World camera field of view (40-140; stock 75).", 40, 140,
+             &g_fov_camera);
   add_slider(view, "Viewmodel FOV",
-             "Weapon model field of view; 0 keeps the game default (54).", 0,
-             120, &g_fov_viewmodel);
+             "Weapon model field of view (20-120; stock 54).", 20, 120,
+             &g_fov_viewmodel);
   add_slider(view, "Gamma x10",
              "mat_monitorgamma x10: 16 = 1.6, 30 = 3.0, stock is 22.", 16, 30,
              &g_gamma);