Convertion has been moved to dedicated class
SystemInfo class review
SystemInfo class now instanciate all SystemInfo and stores them in a
static readonly collection (avoid creating a new class each time we call
DisplayName property).
+ EmulatedSystem enum (in Api) renamed to CoreSystem and moved to
BizHawk.Client.Common
+ this enum is used in SystemInfo class
Created a Joypad class that is populated with JoypadButton enum flags
Input get/set throught ApiHawk works for NES only. So many work remains...
Created an enum (and a convertion function) for emulated system. It
provides a more sexy way to work with SystemID.
It also means that convertion function and enum has to be updated if we
add a new system.