Pokemon Silver as a full launcher version, plus launcher mods-list and title-tempo fixes

Silver: derived import manifest (tools/make_silver_manifest.py re-resolves
the Gold manifest's symbols from pokesilver.sym), silver GameVersion row,
generation-keyed extractor routing, required-files override, edition save
stamping (a Silver playthrough no longer writes into the Gold save),
checkver-driven edition data, SILVER/KAMON/OSCAR/MAX presets, GOLD rival
default, edition credits banner, Lugia title screen (OAM layouts, bob,
trail, palettes as title.lua data keys with Gold defaults so old caches
need no re-import), packaging for every build target, docs, and tests.

Launcher: the installed-mods list is one continuous scroll (rows culled to
the viewport) instead of a pager with an inner scroll viewport; the pad
cursor's edge-scroll no longer runs it to the bottom. The game dropdown
shows just the initial and caret. Find-tab behavior unchanged.

Title tempo: a sprite-anim frame shows duration+1 ticks
(engine/sprite_anims/core.asm GetSpriteAnimFrame), which locks both
editions' 64-tick wing beat to the 64-tick sine bob; the title screens no
longer run fast and out of phase.

tests/engine/android_shortcuts_payload_test.lua

@@ -41,12 +41,21 @@ end
 -- Mock isReady
 RomImporter.isReady = function(v)
   return v == "red" or v == "gold" or v == "blue" or v == "yellow"
+    or v == "silver"
 end
 
 local ok = RomImporter.syncAndroidShortcuts("gold")
 check(ok == true, "syncAndroidShortcuts returns true on Android")
 check(#capturedShortcuts == 4, "syncAndroidShortcuts caps at 4 items")
 check(capturedShortcuts[1] == "gold", "activeVersion 'gold' is placed first")
+check(capturedShortcuts[2] == "red" and capturedShortcuts[3] == "blue"
+  and capturedShortcuts[4] == "yellow",
+  "the rest follow GameVersion.ORDER until the cap")
+
+capturedShortcuts = nil
+RomImporter.syncAndroidShortcuts("silver")
+check(#capturedShortcuts == 4, "a fifth ready game does not widen the payload")
+check(capturedShortcuts[1] == "silver", "activeVersion 'silver' is placed first")
 
 -- Test with subset of ready games (e.g. only Red and Gold)
 RomImporter.isReady = function(v)
@@ -78,4 +87,4 @@ end
 love.system.getLaunchGame = savedGetLaunchGame
 love.system.updateShortcuts = nil
 
-print("8/8 checks passed  (android_shortcuts_payload_test)")
+T.finish("android_shortcuts_payload_test")