User defined increment/decrement step for processInt inputs

[fred-76]

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Subject of the issue

Add an increment/decrement user defined step in the inputs for Integers (instead of incDelta=1 as it is hard defined in void MD_Menu::handleInput.

You could use range[0 or 1].power for that purpose as it is not used in MD_Menu::processInt.

I did that and it works well:

bool MD_Menu::processInt(userNavAction_t nav, mnuInput_t *mInp, bool rtfb, uint16_t incDelta)
// Processing for Integer (all sizes) value input
// Return true when the edit cycle is completed
{
bool endFlag = false;
bool update = false;

int step_int = mInp->range[0].power;

if (step_int == 0) {
step_int=incDelta;
}

and then replace incDelta by step_int in the rest of processInt.