Throwdowns: fixes the docs review found in the kit and its services

- match.teleports lets through only the publishing plugin's own teleports, and only while its
  match runs (its HUD is active, or the native flag is one of its modes); it was merged across
  every plugin and checked no match.
- A mode's timer of 0 or past an hour no longer makes its card do nothing: the native flag takes
  it as 1 to 3600 s. flag.begin's seconds are checked as 1 to 3600, as the flag takes them.
- skater.push and hold(true) return false with a reason without the stock physics, where they
  were dropped unseen.
- telemetry's slam and struck are news since each plugin's own last read; reading them cleared
  them for every plugin.
- A banner or callout of a new match shows whatever serial it starts from, and a document without
  the slot no longer resets its serial.
- SmokeyDawg58's placement no longer divides input.wheel's whole notches by WHEEL_DELTA again.

Extension/Plugins/plugin_api_throwdowns.cpp

@@ -134,7 +134,7 @@ struct KitApi {
         if (!lua_isnoneornil(L, 3)) {
             luaL_checktype(L, 3, LUA_TTABLE);
             options.players = static_cast<unsigned>(number_field(L, 3, "players", options.players, 1, 10));
-            options.seconds = static_cast<unsigned>(number_field(L, 3, "seconds", options.seconds, 0, 3600));
+            options.seconds = static_cast<unsigned>(number_field(L, 3, "seconds", options.seconds, 1, 3600));
             options.setup_page = bool_field(L, 3, "setup_page", options.setup_page);
             options.cursor_height = static_cast<float>(number_field(L, 3, "cursor_height", options.cursor_height, 0, 100000));
         }