Merge pull request #2 from sg-/dev_exporters

[dev_exporter] update ctx to support .o and .ar files. Update uvision te...
[Exporters] File names/paths for uvision, flash algo for k20 record
[Exporters] source files (s and cpp) uvision path/name, yaml - flash/usb corrections
[USBStack] usb_core - c99 inline
[Exporters] export.py - remove commented code
[Exporters] Project within own directory, expand_data method for uvision
[Exporters] Template for projects file, which defines all projects to be built
[Exporters] export.py - new arg - project
[Exporters] Generating - Empty yaml files are ignored
[Exporters] Improvement in handling non-existing yaml files
[dev exporter] Add multiple file extensions to the list of files for a given project