Refactor timer

[YushiOMOTE]

• Relocate ClockDivider/Timer under apu to clock module in top-level, as it's generic logic convenient for emulation.
• Introduce PrescaledTimer, which combines ClockDivider and Timer to support adjustable frequency with timer.
• Separate out DIV logic from CPU Timer
• Simplify DIV logic using PrescaledTimer
• Simplify CPU Timer logic using PrescaledTimer
• Unify FrameSequencer as a single component in APU.
• Simulate DIV-APU event, which is passed as boolean from DIV to APU. The frame sequencer takes it and computes frames.
• Refactor extra clock phenomenon logic on trigger in length counter, which is accurate enough to support a new Same Suite rom test.
• Add Same Suite rom tests.
• Relocate and clean up rom tests.