Handle submit block response in self select client

This PR fixes self-select client with submit-to-origin=true by handling `submitblock` responses.

Previously, the submit block responses would result in an error message
and enter RETRY state because parseResponse expects all responses to be
for `getblocktemplate`.

.gitignore

@@ -4,3 +4,9 @@ scripts/deps
 /CMakeLists.txt.user
 /.idea
 /src/backend/opencl/cl/cn/cryptonight_gen.cl
+*.a
+CMakeCache.txt
+CMakeFiles/
+Makefile
+cmake_install.cmake
+/xmrig