Add multiline strings

[Markos-Th09]

This PR adds multiline stings to clue. Although regular strings can span multiple lines any tab or newline characters are not preserved. This other type of multiline strings preserves those.

The ` symbol is used to denote multiline strings

print(`
hello
world
`)

When this program is run it should output

hello
world

[Maiori44]

Does it need to use its own ComplexToken?
Especially for 3.0 I would need it to use SYMBOL

[Markos-Th09]

Does it need to use its own ComplexToken? Especially for 3.0 I would need it to use SYMBOL

The problem with SYMBOL is that it is used in places where multiline string is invalid so I wasn't sure if it was a good idea to do that

[Maiori44]

SYMBOL can be compiled anywhere, you just have to parse multilined strings in the right place

[Markos-Th09]

SYMBOL can be compiled anywhere, you just have to parse multilined strings in the right place

Hmm ok let me actually make a SYMBOL only implementation of this

[Markos-Th09]

Implemented it without a new ComplexToken

[Maiori44]

I can see a much simpler and faster way to implement this, can I merge this and then change it?

[Markos-Th09]

I can see a much simpler and faster way to implement this, can I merge this and then change it?

Sure