Remove RTC functionality

[B13rg]

Current;y, the game is built to use the real time clock, which was only part of the MBC3 type gameboy cartridge. This limits the ROM to taking up a maximum of 2MB. Since this version is being created in the modern era, where it most likely won't be ona real cartridge, it would be better to separate the cartridge time from real time. This would also allow us to use a MBC5 type cart, which allows us up to 8MB of ROM.

Instead of using the RTC, the game should instead just use in-game ticks. This can also speed up the time, so it'll take 1-2 real world hours for a day to pass in the game. Not only will it make the game move a little faster, it will make it easier to play on computers/emulators, as the time aspects doesn't continue counting when the emulator is closed (usually).

Summary:

• Modify timekeeping from using the RTC to in-game ticks
• Make one in-game day take about 1-2 real world hours
• Increase cart size from 2MB to larger
  • Modify bank selection to use two 8bit numbers instead of 1

Reference on MBCs: https://gbdev.gg8.se/wiki/articles/Memory_Bank_Controllers#MBC5_.28max_8MByte_ROM_and.2For_128KByte_RAM.29

[B13rg]

Memory map between the MBC3 and 5 are mostly the same. Differences:		MBC3	MBC5
RAM	Max 64k	Max 128k
2000-2FFF	7 bits are written here to select RAM bank. Writing 0 will select ROM bank 1	lower 8 bits of ROM bank. Writing 0 will select ROM bank 0
3000-3FFF	continuous with previous range	9th bit of ROM bank goes here

To begin, may only expand to 4MB of ROM, so I don't have to program setting the 9th bit, but it depends on how complex the bank switching code is.

[B13rg]

Instead of using an MBC5, we can instead switch to a tpp1 MBC: https://rgbds.gbdev.io/docs/master/rgbfix.1/#TPP1 This will give us the ROM and SRAM space we need, while preserving the RTC.

->> #109