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Changelog

• PPU: disallow out-of-bounds BG VRAM tile fetches and return open bus (fixes #298)
• Core: do not skip to the next event if the CPU woke up during a DMA (fixes #297)
• KeyPad: always request IRQs from the emulator (not the calling) thread (fixes #290)
• GameDB: fix entries for a bunch of Classic NES and Famicom Mini titles (fixes #302)
• IO: do not enter STOP mode when it is not implemented
• mGBA log: clear the message buffer after printing the message
• mGBA log: flush STDOUT after each message
• Catch fmt::system_error when fmt::print() fails to write to STDOUT (fixes #301)