* C client generator improvement to support:
openapi-generator/modules/openapi-generator/src/test/resources/3_0/petstore.yaml
* Improvements to the C client generator:
- moved base64* from apiClient.c to binary.h/binary.c
- changed CR/LF to LF in binary.h/binary.c
* C client generator: better support for base64encode / base64decode
* New modified model header and body mustache for c client generator
* remove uncrustify from cmake as it is used during code generation, also remove valgrind as it is not used
* add function to encode and decode binary data
* update model mustache
* update api body and header mustache for handling all types of parameters
* update model mustache with variable names and address few more issues to generate working codes
* updated api body and header mustaches with support for various new parameters and fix some issues as per new changes in code flow structure
* update apiClient header and body mustache as per new modifications for handling binary data and few more stuff
* updated samples generated by new modified mustache
* update handling of file and binary data type to binary_t
* update samples with recent commit on master regarding c-generator
* update cmakelist which was ignored by .openapi-generator-ignore, cleanup external folder
* update CMakeList mustache to show how to use compiled libary to compile source files
* update samples with new cmake
* Add comments explaining what each command is doing inshort
* remove freeing of base path as it is not memory allocated
* update samples to free apiclient object when the requirement is over
* add missing cJSON delete to fix memory not freed bugs
* use uncrustify to beautify manual written test code
