add to PreProcessors only hold positive numbers

[NiumXp]

If we put too many endif or else without a pair, we get too many “TOO_MANY_WS” errors:

#endif
#endif
#endif
#endif
#endif
#endif

Error: INVALID_HEADER       (line:   1, col:   1):      Missing or invalid 42 header
Error: PREPROC_BAD_ENDIF    (line:   1, col:   1):      Endif preprocessor statement without if, elif or else
Error: TOO_MANY_WS          (line:   1, col:   1):      Extra whitespaces for indent level
Error: TOO_MANY_WS          (line:   2, col:   1):      Extra whitespaces for indent level
Error: TOO_MANY_WS          (line:   3, col:   1):      Extra whitespaces for indent level
Error: TOO_MANY_WS          (line:   4, col:   1):      Extra whitespaces for indent level
Error: TOO_MANY_WS          (line:   5, col:   1):      Extra whitespaces for indent level
Error: TOO_MANY_WS          (line:   6, col:   1):      Extra whitespaces for indent level

To fix it, we can change the indentation value to max(0, indent) in CheckPreprocessorIndent, but we won't get the errors that every endif must have a #if, #elif or # else, because in IsPreprocessorStatement we check whether the indent == 0 instead of < 1.

To fix these two bugs, we need to make indent hold only positive integers as a value. Result:

Error: INVALID_HEADER       (line:   1, col:   1):      Missing or invalid 42 header
Error: PREPROC_BAD_ENDIF    (line:   1, col:   1):      Endif preprocessor statement without if, elif or else
Error: PREPROC_BAD_ENDIF    (line:   2, col:   1):      Endif preprocessor statement without if, elif or else
Error: PREPROC_BAD_ENDIF    (line:   3, col:   1):      Endif preprocessor statement without if, elif or else
Error: PREPROC_BAD_ENDIF    (line:   4, col:   1):      Endif preprocessor statement without if, elif or else
Error: PREPROC_BAD_ENDIF    (line:   5, col:   1):      Endif preprocessor statement without if, elif or else
Error: PREPROC_BAD_ENDIF    (line:   6, col:   1):      Endif preprocessor statement without if, elif or else