multiple chirp working
rewrote get_available rapp logic
preferred or default rapp selection
rename angry_cat to angry_cat_chirp
postfix for chirp apss
use yaml format for default app parsing
use preferred instead of selected and defaults
Refined the comment for the preferred defaults

Also removed legacy app_store_url.
Merge pull request #248 from robotics-in-concert/multiple_impl

Allows Multiple implementation . Default Rapp selection.