Qt: Properly set default video recording settings
Qt: Fix config options being erroneously added as null
Qt: Rudimentary settings window
GBA: Add bilinear resampling option
GBA: Add option to skip BIOS start screen
Qt: Set default log level to FATAL, ERROR and WARN
GBA Audio: Make larger buffer sizes than 2048 actually work properly
GBA Audio: Audio buffer sizes are now correct sizes for both sample rates