COMPILER create literal node instead of value

# VALUE nodes are now called LITERAL
# If nodes now only create “elseif” node if code has any “elseif”
instruction
TEST new intermediate code case tests

# automatic test updated too
ICG improvement

# documentation
# while nodes
# if nodes
# expression nodes
# attribution nodes
# return nodes
# block nodes
# dump function
LUACOV bat to run luacov with autotest

luacov report updated
TEST dynamic test changed