Cleaned up imports.
Extracted test helpers to dedicated module.
Code cleanup.
PlatformTree how has node iterator.
Test helpers now provide ExtCtxt.
Basic code builder with tests.
Fixed crappy parser flattening code. \o/
More helper methods in Node.
Builder builds lpc17xx clocks.
node.subnodes is now a hash (by path).
Removed obsolete code.
Removed broken/obsolete macro code.
Extracted lpc pt code to src/hal/lpc17xx once again.