Add LPC MIN_INT, MAX_FLOAT, MIN_FLOAT predefines.
Test: Update testsuite config to correctly launch.
Test: Improve logging for tests in testsuite.
Test: LPC int/float correctness verification.

It will pass as long as it is stored as C 64-bit int & double,
as well as parser correctly parse constant literals.
Test: Fix "speed" command in testsuite.

And update motd to show two new commands.
Test: add command "crasher" for auto crash testing
Test: add test for save_object(int).