Improve lisp

[vinc]

Add improvements to the Lisp to be able to participate in the Advent of Code 2022.

• Add chunks function
• Add slice function
• Add sort function
• Add uniq function
• Add filter function
• Add intersection function
• Add trim function
• Add split function
• Add chars function
• Add words function
• Add splice with @ shortcut in variadic functions
• Change lines function
• Change length function
• Change set function

[vinc]

The sort_by used in sort had to be changed to sort_unstable_by has it was causing a general protection fault while running the tests of the shell.

[vinc]

Splitting the code of default_env reduced the kernel file size from 2008064 to 2000896 bytes. This is extremely close to the 2 MB limit where the kernel will overwrite beginning of the rest of the file system.

[vinc]

The function (set <symbol> <value>) will now return the value instead of the symbol, unlike (define <symbol> <value>) that still returns the symbol.

(define i 0)    # => i
(set i (+ i 1)) # => 1
(set i (+ i 1)) # => 2

[vinc]

Add splice with @ as a shortcut for variadic functions:

((function (a @b) a) 1 2 3) # => 1
((function (a @b) b) 1 2 3) # => (2 3)