SPRINGFIELD — A budget advanced by lawmakers would significantly change the landscape in a state that’s been without a full spending plan for two-plus years.It would raise the income tax rate for individuals and businesses. It could curb the pileup of unpaid bills, potentially stave off an unprecedented “junk” credit rating and allocate money to struggling universities and social services.But at least one thing would generally stay the same if the plan goes into effect — the amount of money …