Colorize javac errors

You know those multi-line ones that are frequently interspersed with other buld output?
The ones that don't even have the word "error" in them to search for?

This makes them red.

ps2: fix jar_check failures cause by leaving empty stderr files in intermediates dirs
     this is probably not the best place to store stderr before colorizing it if javac
     exits non-zero, but it seems much lighter than mkdiring a bunch of temp directories
     or using sed to mangle the paths to point to per-intermediates directory unique
     temporary file names

Change-Id: I3b9b7d8a0c76958588ac1603b6742987d6dde54c
Signed-off-by: nuclearmistake <nuclearmistake@gmail.com>
build: Build with colors

Based on tpruvot/chirayudesai's commits, add some color to stdout
and but make it a little easier to customize. Colors are now mapped to
categories and can be edited in Makefile if you or your terminal's
background color do not like them. Defaults:

host stuff: yellow
target stuff: cyan
install/copy: green
filesystem/images: green
imports/exports/includes/notices: green
deletes: red
complete msg: bold green

Coloring can be disabled with "export BUILD_WITH_COLORS=0"

Change-Id: Idcfe9bbf925759f88425f914269855da05c5eef0

Conflicts:
	core/Makefile