Start moving the tests into subfolders. Transition to SCons for build system for the tests.

Only a few tests updated so far. Have to include all the rest before merging to mainline.

Update issue 63
Status: Started

tests/encode_unittests/SConscript

@@ -0,0 +1,5 @@
+# Build and run the stand-alone unit tests for the nanopb encoder part.
+
+Import('env')
+env.Program(["encode_unittests.c", "#common/unittestproto.pb.c", "#common/pb_encode.o"])
+env.RunTest('encode_unittests')