Add a button to the Study Intro that allows the user to continue from their last added kanji.#168

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TylerLafayette wants to merge 3 commits intofabd:masterfrom

TylerLafayette:master

Commits on Nov 15, 2019

Add a button to comntinue from the last kanji you added to flashcards.
TylerLafayette
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Commits on Nov 16, 2019

Changed StudyIntro to use maximum Rtk sequence number instead of flashcard count to show Continue button.
TylerLafayette
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Commits on Jan 10, 2020

Remove getMaximumSequenceNumber and modify study continue button to use getHeisigProgressCount instead
TylerLafayette
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