HF RL Explorer

I want WebMSX to support the ASCII8 cartridge format as a stateful mapper.

I want WebMSX to support the ASCII8 cartridge format as a stateful mapper.: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). ASCII8 should also appear in wmsx.SlotFormatsUserOptions , and automatic selection should accept ROM content that is at least 8 KiB, is an…

The task

`ASCII8` should also appear in `wmsx.SlotFormatsUserOptions`, and automatic selection should accept ROM content that is at least 8 KiB, is an exact multiple of 8 KiB, and starts with the cartridge header bytes `0x41, 0x42`; content that is not an 8 KiB multiple or lacks that header should not be selected as `ASCII8`…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.