Support configuratable screen offset and remove resolved TODOs

include/PSX/System/IOPorts/cd_io.hpp

@@ -164,7 +164,6 @@ namespace JabyEngine {
                 Interrupt::Type complete_irq;
             };
 
-            // TODO: Seems they all need to be ACK? Can we remove this?
             static constexpr Desc GetStat{0x01, Interrupt::Type::Acknowledge};
             static constexpr Desc  SetLoc{0x02, Interrupt::Type::Acknowledge};
             static constexpr Desc    Play{0x03, Interrupt::Type::Acknowledge};

include/PSX/jabyengine_config.hpp

@@ -13,6 +13,8 @@ namespace JabyEngine {
             }
         };
 
+        static constexpr auto DisplayDefaultOffset = GPU::PositionI16::create(0, 0);
+
         struct Periphery {
             static constexpr bool include_portB() {
                 return false;