Apply clang-format and cmake-format and add style check workflow (#171)

* apply clang-format and cmake-format and add style check workflow

* add declare package definition

* add additional public methods and rename internals

* change development verison tag to 1.0.0

* rename internal method

* rename public method

* rename test var

* update copyright and fix comment

* typo

* run fix-format

* fix test function names

examples/yaml/main.cpp

@@ -1,7 +1,8 @@
 #include <yaml-cpp/yaml.h>
+
 #include <iostream>
 
-int main(int argc, char ** argv){
+int main(int argc, char** argv) {
   if (argc != 2) {
     std::cout << "usage: " << argv[0] << " <path to yaml file>" << std::endl;
     return 1;