Add new settings & configuration options

[Arignir]

Emulation

• Import save
• Export save
• Change the save directory
• Change the quicksave directory
• Raise the maximum amount of recent files up to 10
• Rename "max speed"/"unbounded speed" to "fast forward"
• Support partial speeds (25%, 50%, etc.)
• Raise the maximum amount of quicksaves up to 10
• Enable/Disable the emulation of the prefetch buffer
• Main/Alternative speed

Video

• Enable BG layer X
• Enable OAM
• Frame skip

Audio

• Enable Channel X
• Enable Fifo Channel X

Misc

• Pause the game when the windows looses focus
• Automatically resume the last played game on startup
• Hide cursor after X seconds of inactivity
• Hide menubar after X seconds of inactivity
• Screenshot directory
• Text/Alpha when paused
• Show FPS
• Fullscreen

Bindings

• Toggle the settings menu
• Main/Alternative speed
• Quicksave bindings for all quicksaves
• Mute sound
• Hide menubar
• Allow key modifiers in bindings (ctrl/alt/shift)
• Set the default bindings for quicksaves to 1..0
• Toggle fullscreen

Implementation

• Revamp the code to have a settings struct that you can compare against and restore
• Use a common message to set all the runtime-related settings (speed, video/audio layers, etc.)
• Cancel/Reset buttons