Prepare for handling pkg state with files. So it requires having the
path defined before declaring targets. In addition, it cleans up the
old git-download target.
This release fixed some bugs related to disabling float support in the
parser.
The float support is now optional and can be enabled by including the
tinycbor_float module. This allows for compiling on AVR as that platform
doesn't support the float specific defines used by tinycbor.
