Started to migrate to target_compile_options (#7222)

* Started to migrate to target_compile_options

* combined compile options together. Added Mac CI builds

* remove arm build (not supported). Fixed old-style-casts

* moved to using a ProjectConfig interface library to specify options

* remove the explicit CMAKE_CXX_STANDARD

samples/sample_bfbs.cpp

@@ -46,7 +46,8 @@ int main(int /*argc*/, const char * /*argv*/[]) {
 
   // inizialize parser by deserializing bfbs schema
   flatbuffers::Parser parser2;
-  ok = parser2.Deserialize((uint8_t *)bfbs_file.c_str(), bfbs_file.length());
+  ok = parser2.Deserialize(reinterpret_cast<const uint8_t *>(bfbs_file.c_str()),
+                           bfbs_file.length());
   assert(ok);
 
   // parse json in parser from fbs and bfbs