1.4.1

Performance
28f4ff2 optimize window drawing (don't draw tiles that are covered by window)

Correctness
4decd1d Fix ld sp,hl/imm16 to use page table for switchable WRAM banks
7caca2f Fix LY wait and HALT timing in CGB double speed mode
c0a30de Fix inc/dec clobbering carry flag, breaking Pokemon Crystal menus
6e6f26d Flush pending HDMA transfers on cancel (partial fix for sourcrystal)
8e30a2b add extra cycles for taken branch

UI
de2b956 Disable changing double speed in-game.