New icon set

Thanks @Koulis2000
ABBAmp: Add LPA mode and Charge pump toggles
Fix ABBamp restores

Writing gain=?? also enables the gain. We should ask before if the checkbox is checked before writing gain values.
Merge together the double-checkboxes

I replaced the double-checkboxes with only one that enable/disable the tweak and also the 'mode'.
Add LPA mode control