Implement in-memory savestates (#1693)

* Refactor Savestate::Var{8,16,32,64}

- They now delegate to VarArray
- They're declared in the class header so they're likely to be inlined

* First crack at refactoring Savestate to work in-memory

- Well, third, but who's counting?

* Implement Savestate::Finish

* Remove the VersionMajor and VersionMinor fields

- Instead, pull their values directly from the savestate buffer

* Mark a new constructor as explicit

* Rename Reset to Rewind

* Fix a linebreak

* Implement Savestate::Rewind

* Add ROMManager::ClearBackupState

* Refactor ROMManager to use the refactored Savestate

* Capitalize "Least"

- It was driving me nuts

* Add a log call

* Increase default Savestate buffer length to 32MB

* Use C-style file I/O instead of C++-style

- Dumping bytes to a file with C++'s standard library is a MONSTROUS PAIN IN THE ASS

* Quote the savestate's file path for clarity

* Write the savestate's length into the header

* Add some extra logging calls

* Fix section-loading

* Remove the deprecated Savestate constructor

* Convert a char* to a u32 with memcpy, not a cast

* Fix section-handling in loads

* Include <cstring> in Savestate.h

- This was causing a build error on Linux

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