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.

src/ui/gen2/OakSpeech.lua

@@ -72,8 +72,8 @@ end
 
 -- Naming presets are boot config the same way Gen 1 reads them
 -- (field.boot.namePresets), so a total conversion that replaces the list once
--- replaces it for both games; NamePick.PRESETS (data/player_names.asm
--- PlayerNameArray) is Gold's fallback.
+-- replaces it for both games; NamePick.presetsFor (data/player_names.asm
+-- PlayerNameArray) is the running edition's fallback.
 local function namePresets(game, who, fallback)
   local boot = game and game.data and game.data.field
     and game.data.field.boot
@@ -351,9 +351,9 @@ function OakSpeech:openNamePick(step)
     picColors = self.playerColors,
     presets = step.presets
       or namePresets(self.game, step.presetsWho or step.who or "player",
-                     step.presetsFallback or NamePick.PRESETS),
+                     step.presetsFallback or NamePick.presetsFor()),
     onDone = function(name)
-      name = name or "GOLD"
+      name = name or NamePick.presetsFor()[1]
       self.game.save.player.name = name
       self.game.stack:pop() -- NamePick
       self.busy = false