new vblank event, used by cheats, lua and naomi net
new udp net protocol for naomi. rx/tx on vblank on emu thread.
input: rumble power configurable (Issue #158)
ui: rumble intensity slider, enable/disable upnp
aica: hook to consume midi out
decode midi out to simulate rumble for initd
upnp can now be disabled
Refactor imgui backend code into imgui drivers for gl, vk, dx9
Generic GraphicsContext interface for gl/vk/dx9 contexts
Simplify graphics api switching code
dx9, gl(sdl): set swap interval based on monitor refresh rate.
Flyinghead