Feat: Moves methods from MainPageController into a new class responsible for...

Feat: Moves methods from MainPageController into a new class responsible for saving/loading the game state. Includes tests.

Closes #33 (closed)

added To do label

requested review from @sverrgha

assigned to @nicklapt

added 8 commits

• 47d7154a...f1457f95 - 7 commits from branch dev
• 5d39005f - Merge: Resolve conflicts when merging refactor controller class with dev.

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merged

mentioned in commit 33dce6a0