implements issue #134
if true, formatting enabled
if false, formatting disabled
if unset, formatting configured as before
sbt.log.noformat is no longer recommended, but is supported:
a. setting it to 'true' explicitly disables formatting
b. if 'false' or unspecified, autodetection is used
c. sbt.log.format takes precedence if defined
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
no longer has any dependencies
small ProcessLogger interface to send buffered out/err to
commented out (but working) implicit conversions from Logger -> ProcessLogger
for use in an integrating project to get original functionality