Shift the framebuffer according to VO_STARTX and VO_STARTY.
Issue #594
GlVertexArray class to handle vertex arrays (or lack thereof)
lr: Fix PowerVR2 filter including in full fb emu mode. Use quad to draw
vmus and lightgun xhairs.
* cmake: use c++17
* Use std::size
* Use std::make_unique
* Use std::clamp
* Use structured binding
* Use [[fallthrough]]
* Use enable_if_t/is_enum_v/is_integral_v/is_same_v
* Use if constexpr
* Use try_emplace
* Use auto for iterators
* Use inline variables