Replace int with string on thread monitor stat collection

[leoparente]

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[leoparente]

thread_stat.ignore(' '); was causing different behaviors, and stat has string and int values. So the best approach is to read everything as string and then convert the necessary values

sample stats:

98 (cat) R 18 198 18 34817 198 4194304 78 0 0 0 0 0 0 0 20 0 1 0 1299013 4505600 185 18446744073709551615 4194304 4238828 140735373488928 0 0 0 0 0 0 0 0 0 17 6 0 0 0 0 0 6339656 6341408 19660800 140735373490557 140735373490584 140735373490584 140735373492203 0