Bases on sources from the computer language benchmarks game

Finally some tests from Team 2

Added Group 5 semantic tests

Semantic tests added from group 1

exec test layout tweaks, fixes for small/big Int literals

maxInt was one to bit, it's 2^32 / 2 - 1 == 2147483647

minInt is a bit more complicated...

There are no negative integer tokens.

    -2147483647 is a unary minus followed by a 2147483647 integer literal

but, what is  -2147483648  ?

    -2147483648 is a unary minus followed by a 2147483648 integer literal

which is out of bounds...

The parser could move the minus into the integer literal, making it
negative, but that would technically be constant folding and shouldn't
happen at this stage.

I think this makes it clearer at a glance that these are test files and
not test-stdlib packages

semantic tests (gruppe 4)

Add simple import statement preprocessor

[gruppe 4] tests, null byte Diskussion

Siehe "3.1 Wortschatz"

Leerraum: Dazu zählen Leerzeichen, Zeilenumbruch, Wagenrücklauf und Tabulator

Des Weiteren ist es weder Kommentar, Schlüsselwort, Operator, Separator
IDENT oder INTEGER_LITERAL.

Regarding array access and creation with null and basic arithmetic operations

Changed the ast flag to --print-ast and properly save pretty-printed input files