fix: Remove Arduino entry points

Improved flexibility by removing the Arduino entry points in favor of manual calls to setup/loop that the user can call from their entry point.  This is the more common use case for Arudino.

Also added the gtest/gmock_main files to the PlatformIO ignore list since we are not supporting that feature.

googlemock/src/gmock_main.cc

@@ -32,22 +32,6 @@
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
-#ifdef ARDUINO
-void setup() {
-  // Since Arduino doesn't have a command line, fake out the argc/argv arguments
-  int argc = 1;
-  const auto arg0 = "PlatformIO";
-  char* argv0 = const_cast<char*>(arg0);
-  char** argv = &argv0;
-
-  // Since Google Mock depends on Google Test, InitGoogleMock() is
-  // also responsible for initializing Google Test.  Therefore there's
-  // no need for calling testing::InitGoogleTest() separately.
-  testing::InitGoogleMock(&argc, argv);
-}
-void loop() { RUN_ALL_TESTS(); }
-#else
-
 // MS C++ compiler/linker has a bug on Windows (not on Windows CE), which
 // causes a link error when _tmain is defined in a static library and UNICODE
 // is enabled. For this reason instead of _tmain, main function is used on
@@ -68,4 +52,3 @@ GTEST_API_ int main(int argc, char** argv) {
   testing::InitGoogleMock(&argc, argv);
   return RUN_ALL_TESTS();
 }
-#endif