Implement more robust way of handling CCS installation paths

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Make TIFlash handle CCS installation locations in a more robust manner.

Context

CCS is not always installed in the default install location. Many times users may have multiple versions of CCS installed and thus place them in a different directory structure.
e.g.
/Applications/ti/CCS7.4/ccsv7/...
/Applications/ti/CCS8.0/ccsv8/...
/Applications/ti/CCS8.1/ccsv8/...

Expected result

TIFlash should be able to find the proper CCS installation even when the CCS installation directories are not structured as the default.

Current result

TIFlash relies on a particular, hardcoded directory structure for CCS installations.
e.g.
/Applications/ti/ccsv7/...
/Applications/ti/ccsv8/...

Possible Fix

Replace hardcoded method with a searching algorithm that searches for the "ccs root" folder. The "ccs root" folder should always contain:

1. An eclipse/ folder with ccs.properties file and ccstudio or eclipsec.exe executable
2. A ccs_base/ folder

By searching for these requirements, TIFlash should be able to find a valid CCS installation given a CCS_PREFIX (e.g. /Applications/ti) without using a hardcoded path

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