Add usable item filter, projectile ESP and gravity-gun melee

- Items: "Only if usable" hides health tags at full health and armor at full
  suit. Health ceiling is the server player's m_iMaxHealth; armor uses the
  server m_ArmorValue against HL2's 100 cap. Fails open when unreadable.
- Projectiles: new Visuals feature/card for thrown grenades, RPG rockets,
  helicopter bombs and AR2 balls. Fuse from server m_flDetonateTime vs engine
  time; radius from m_DmgRadius with per-type fallback; optional 24-segment
  radius ring and FRAG timer label.
- Melee: the killbot now handles the gravity gun as well; only VULNERABLE
  targets, 1200-unit range, primary attack to launch the held object, and no
  aim-punch compensation because the launch uses EyeVectors.
- Server/netvars: m_ArmorValue, m_flDetonateTime, m_DmgRadius.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/netvars.cpp b/src/netvars.cpp
index 33fd6a3..ef564cd 100644
--- a/src/netvars.cpp
+++ b/src/netvars.cpp
@@ -107,6 +107,11 @@ static void collect_netvars(uintptr_t table, uintptr_t base_off, int depth) {
       int off = (int)(base_off + (uint32_t)poff);
       if (off >= 0x20 && off <= 0x2000)
         g_net.default_fov = off;
+    } else if (strcmp(pname2, "m_DmgRadius") == 0 &&
+               g_net.dmg_radius < 0) {
+      int off = (int)(base_off + (uint32_t)poff);
+      if (off >= 0x20 && off <= 0x2000)
+        g_net.dmg_radius = off;
     } else if (strcmp(pname2, "m_iTeamNum") == 0 && g_net.teamnum < 0) {
       g_net.teamnum = (int)(base_off + (uint32_t)poff);
     } else if (strcmp(pname2, "m_vecOrigin") == 0 && g_net.origin < 0) {
@@ -288,11 +293,12 @@ void resolve_netvars() {
   logf("netvars: flags=%d velocity=%d movetype=%d health=%d maxhealth=%d "
        "teamnum=%d origin=%d viewoffset=%d mins=%d maxs=%d lifeste=%d "
        "modelindex=%d absvelocity=%d activeweapon=%d owner=%d "
-       "weapon_owner=%d clr_render=%d punch=%d default_fov=%d",
+       "weapon_owner=%d clr_render=%d punch=%d default_fov=%d "
+       "dmg_radius=%d",
        g_net.flags, g_net.velocity, g_net.movetype, g_net.health,
        g_net.maxhealth, g_net.teamnum, g_net.origin, g_net.viewoffset,
        g_net.mins, g_net.maxs, g_net.lifestate, g_net.modelindex,
        g_net.absvelocity, g_net.activeweapon, g_net.owner,
        g_net.weapon_owner, g_net.clr_render, g_net.punch,
-       g_net.default_fov);
+       g_net.default_fov, g_net.dmg_radius);
 }