ESP: classify NPC damage immunity/armour/vulnerability

- Resolve server m_takedamage (DAMAGE_NO/DAMAGE_EVENTS_ONLY = immune).
- Classify gunship/strider/dropship as ARMORED (OnTakeDamage only accepts
  DMG_BLAST; only the RPG passes), and headcrab/antlion/manhack as VULN
  (gravity gun / physics impact).
- ESP draws ARMORED/VULN/IMMUNE tags above the name (new "Damage tags"
  toggle, [esp] dmg).
- Aimbot, silent aim, triggerbot and melee skip immune targets and armoured
  targets unless the active weapon is the RPG.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/gui.cpp b/src/gui.cpp
index ebc1f62..b5fbc1d 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -359,12 +359,13 @@ static void build_cards() {
   static const char *esp_names[ESP_OPT_COUNT] = {
       "Show neutral",   "Show healthbar", "Show healthnum",
       "Show name",      "Show skeleton",  "Show box",
-      "Show speed graph"};
+      "Show speed graph", "Damage tags"};
   static const char *esp_descs[ESP_OPT_COUNT] = {
       "Include neutral wildlife.", "Draw a health bar.",
       "Draw the numeric health value.", "Draw the model name.",
       "Draw the animated bone links.", "Draw a bounding box.",
-      "Draw the lower-center speed graph."};
+      "Draw the lower-center speed graph.",
+      "Label ARMORED (needs blast/RPG) and VULN (gravity gun) units."};
   for (int i = 0; i < ESP_OPT_COUNT; i++)
     add_toggle(esp, esp_names[i], esp_descs[i], &g_esp_opt[i]);