parse: add script dumping
parse: add parsing and dumping of nested blocks and colons
test: script: add 2 basic tests
parse: fix error handling
parse: rename *_inst_block to *_block
parser: add basis for expression parsing
parse: add stup for destroy_expr()
parse: fix memleak in parse_block()
parse: add support for integer, id, and astring literals
parse: fix memleak in literal handling
parser: add return parsing
test: script: add test for return and literals
parser: rename acs_inst to acs_id