updated compile tests for new minimal AnalysisCallback
moved discovery to discovery/ subproject and updated for new approach
fixed discovery to only find public methods when searching for annotated definitions
extracting inherited definitions unimplemented in api/, so some discovery tests fail
moved discovery classes from sbt.inc package to sbt.compile
Reduce AnalysisCallback interface:
remove discovery
simplify dependency notification methods
Use map of classpath entry to Analysis for locating
source API for external dependencies
Handle classpath changes by locating class
on classpath and either locating Analysis/Source
as above or comparing Stamp. This requires storing
the class name of a binary dependency now.
Make this process aware of full classpath, including
boot classpath