feat(multi-line): Allow multi-lines in Range-cards include empty lines.

[ikozhma]

Before:
Range card didn't allow multiline patterns to include empty lines
Example1:

#Q
line1

line2
?
line3

line4
#/Q

The parsed card will be line2 ? line3 while line1 and line4 are cut out.

Now all lines are included and the card will look like exactly as it is written.
I checked that this change interacts gracefully with sub-cards splitters.
As they have priority over multi-lining.

[linanwx]

Hi, thanks for the PR!

I have a concern about backward compatibility.

I tried the case:

#Q  #AOSR/5n2c4
a
b

c
? #AOSR/5n2c4/m/7mvf
d

e
? #AOSR/5n2c4/m/3pgr
f
#/Q

The old implementation found 2 patterns, but the new one found 1 pattern.

I may need some time to think about this PR. If you have any ideas, feel free to talk.

[ikozhma]

@linanwx
The new one also finds 2 patterns if you turn on the feature "Allow empty line as splitter". It seems you definetely want this empty line to be a splitter in your example.
Or you could manually put *** splitter between the patterns so that they are treated as separate.