#655 feat: adds indentation instead of curly braces for and if blocks

[siowyisheng]

TESTED with the following cases

(1) simple case for

for n from 1 to 3
    echo n

(2) simple case if

if 5 more than 3
    echo 1
    echo 2
    if 5 more than 3
        echo 3
    echo 4

(3) dropping down two levels of indentation

if 5 more than 3
    echo 1
    echo 2
    if 5 more than 3
        echo 3

(4) test for backward compatibility (the output repeats the curly braces, which is ugly but the code still works)

for n from 1 to 3
{
    echo n
}

(5) test with python integration

py begin
for i in range(5):
    print(i)
py finish

for n from 1 to 3
    echo n

(6) test for inconsistent numbers of spaces - the code errors out with ERROR - use a consistent number of spaces for indentation

if 5 more than 3
    echo 1
    echo 2
    if 5 more than 3
        echo 3
      echo 4

[siowyisheng]

removed this as the single line "if" is no longer used.

[kensoh]

Perfect!!