catch3/include/external/tbc_text_format.h, branch v1.5.4

catch3/include/external/tbc_text_format.h, branch v1.5.4 Progmasoft Catch3: an independently maintained C++17 test framework with a parallel runner, property checks, snapshots and structured results. New version of Clara 2014-03-17T18:40:58+00:00 Phil Nash 2014-03-17T18:40:58+00:00 472dc2a61f9588ba817799742bac15d83c2432be - interface changed slightly - moved clara.h and tbc_text_format.h into “external” folder

- interface changed slightly
- moved clara.h and tbc_text_format.h into “external” folder