CreateTokenEffect needs to be refactored to allow creating multiple types of tokens in one CreateTokenEvent

[Grath]

Issue: When multiple tokens of a different type are created such as by [[Trostani's Summoner]], they currently create multiple CreateTokenEvents which cause problems with replacement effects such as [[Queen Allenal of Ruadach]] and [[Peregrin Took]] which add more additional tokens than they should.

Proposed solution:

• Create a TokenBatch or similar, which can contain a collection of Tokens and CreateTokenCopyTargetEffects (or something else that can specify "Create a token copy that's different" for [[Soul Separator]] support) which are then putOntoTheBattlefield in a single CreateTokenEvent which already supports creating a collection of tokens.
• Refactor CreateTokenEffect to take a TokenBatch instead of Token, retaining the Token constructors with a "encase the Token in a TokenBatch, then use the TokenBatch constructors" to reduce duplicated code rather than making a separate CreateTokenBatchEffect but not requiring every CreateTokenEffect to be rewritten.
• Rewrite (or initially write) the following cards (and possibly more) to use TokenBatches to properly create all their multiple tokens in a single CreateTokenEvent: Bestial Menace, Farmer Cotton, Fae Offering, Battle for Bretagard, Forbidden Friendship, Old Rutstein, Somberwald Beastmaster, Song of Earendil, probably Stangg Echo Warrior, Specimen Collector, ~~Soul Separator~~, The Eleventh Hour, Triplicate Titan, Trostani's Summoner, Wurmcoil Engine, Clone Legion, Elminster's Simulacrum, Hate Mirage, Hour of Eternity, Haunting Imitation, Kindred Charge, March of Progress, Mirror March, Mirror-Style Master, Parallel Evolution, Red Sun's Twilight, Rhys the Redeemed, Saheeli the Gifted, Second Harvest, Twinflame, Ocelot Pride