Correctly ported some methods to their gdscript equivalents

[noidexe]

More complex text (e.g: https://r12a.github.io/scripts/tutorial/summaries/arabic ) was failing due to part of the code using methods present in python but not in gdscript

Notably:	Python	GDScript
my_list.extend(other_list)	my_array += other_array
List.pop()	Array.pop_back()
my_list.pop(idx)	my_list[idx]; my_list.remove(idx)
a,b = some_array.pop()	var tmp = some_array.pop(); a = tmp[0]; b= tmp[1]
a == b == "some string"	a == b and b == "some string"

Known issues:

• The latin text was reversed in the output. I could paste the reversed output into arabic_input to get it to display correctly but it's cumbersome
• Autowrap doesn't work corectly but I'm pretty sure it didn't before. I don't know if there is a way to fix that in gdscript without proper RTL support.

[3akev]

LGTM, and sorry for taking so long!