Move the emulator into crates/gba-core, the original demo programs into
crates/gba-demos, and the minifb frontend into crates/desktop. The binary
is now gameboy-rust. Imports change from gba_rust to gba_core/gba_demos;
no behavior changes.
gba-core has no dependencies. Its integration tests use gba-demos as a
development dependency.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Execute SWI 0x00 through original ARM code. Read the restart flag before clearing 512 bytes of BIOS work RAM, reset System/SVC/IRQ stacks and specified registers, then branch to ROM or EWRAM in ARM System mode.
Keep device state and clocks active, preserve unrelated CPU banks, and document the deterministic IRQ-masked restart status. Add eleven tests for every flag byte, ARM/Thumb and User/System callers, exact memory bounds, bank state, restart execution, DMA/timers, and unsupported exception callers.
Validated on Darwin arm64: 705 default and 694 core-only tests in debug and release; formatting, Clippy, rustdoc, ten native window smoke tests, and CPU/timer demos pass.
