Added menu and skin allocations for RenPSP 0.4+

+ Adult Content boolean trigger now persistent and adjustable in in-game
menu
+ Added menu and settings allocations for cheatcodes and language
options
+ (EXPERIMENTAL) $Self:Load() in in-game menu
+ Persistent first run boolean trigger and Hanako route Easter egg
trigger now set
+ Added 4LS logo BGM
Removed unnecessary helpfile bits.

(#Fact: The ikezawa helpfile was directly copied from the port of
Dischan's 'Juniper's Knot')