Fixed some core options:
    - psx.input.port1.multitap was renamed for some reason to psx.input.pport1.multitap
    - psx.input.port2.multitap was renamed for some reason to psx.input.pport2.multitap

    Dualshock analogs were "broken", mednafen has psx.input.analog_mode_ct, if true then you toggle analogs by pressing start+select+l1+l2+r1+r2 for roughly two seconds. In the libretro port it was set to 1 always.
    I've made this a core option:
    setting_psx_analog_toggle, this enables/disables the MODE button, defaults to disabled.

    I think a sane default is for it to be disabled and analogs to work out of the box so I have added that too.
    If setting_psx_analog_toggle is enabled then it replicates mednafen's and the psx's  behavior, MODE button works and by default it's off, so analogs are off.