Add swap percent suggestions

[DRadmir]

[abelokoj-github]

As an addition to this, Instead of having just fixed values for the % boxes there should be an empty box where the user can enter a specific % value when swapping. This should function similar to entering slippage in pancakeswap.

Maybe you can use an adjustable slider that allows the user to slid from 0 to 100% (similar to what is available in Trust wallet).

Thanks for all the great work