Avoid crash when result of lookup is null

Add rules about language design and philosophy

Update recorder to latest

Do not pre-evaluate the `else` side of `if` statements

Add hard rule about LLVM going through llvm-crap

Fix parameter code generation to fix library-writeln-twice case

Add test for library writeln with two arguments

Add test for negative if statement

Add test for multiple if statements

Add simple if statement test

Add factorial loop test

compiler: Add metabox support

interpreter: Add metabox support

debug: Do not recurse by default in xldebug

Switch convention for garbage-collected pointers