Quality of Life Improvements

This release for the RG350(M) - and related devices - is identical to tonyjih's fork, but with the following QoL enhancements:

• A new Core settings > Menu Toggle Combo option has been added. This allows the selection of a button combo that can be used (in addition to POWER) to open the menu while a game is running. Available combos are L3+R3 and SELECT+START.

• A new GPU settings > (HW) Keep Aspect option has been added. When using the hardware (IPU) scaler, this allows pixel aspect ratio scaling to be enabled/disabled.

• A new GPU settings > (HW) Video Filter option has been added. When using the hardware (IPU) scaler, this allows selection of the image filtering method from one of: bicubic (default), bilinear or nearest.

• Optional per-disk memory cards are now supported. Setting Memory card Slot1/2 to the lowest value will create memory cards named after the disk serial number. When swapping CDs, any per-disk memory cards will be swapped out to match the new serial unless a multi-disk .pbp is being used (where it's one set of memory cards per .pbp file).

• Configuration overrides are now supported. Selecting Config Override from the main menu will save the current settings into a disk-specific config file, which will thereafter be used instead of the default when loading/exiting the game.