TOML config file support and migration (#2221)

* TOML config file support and migration

* Add config override support via a CLI option

* Incorporate config changes from #2214

* Remove deprecation as this currently fails to compile on CI

* Add default empty vector to read_node_config_toml

* Make sure override streams are not empty

* Adjust unit tests with changed base/override order

* Incorporate config changes from #2198 and reorder some methods

* httpcallback section, and documentation improvements

* Clarify data type for wallet account, formatting

* CI formatting

* Improved node config unit test coverage, address review feedback

* Full node and rpc config file coverage. Fix httpcallback deserialization.

* Improve toml diff test

* Use const ref in toml config, fix schema type for rpc_path

* Incorporate work watcher period from #2222

* Add work_watcher_period validation as well as unit test

.gitmodules

@@ -15,3 +15,6 @@
 	path = gtest
 	url = https://github.com/google/googletest.git
 	branch = v1.8.x
+[submodule "cpptoml"]
+	path = cpptoml
+	url = https://github.com/cryptocode/cpptoml.git

CMakeLists.txt

@@ -193,6 +193,7 @@ else ()
 	set (BOOST_PROCESS_SUPPORTED 1)
 endif ()
 
+include_directories(cpptoml/include)
 add_subdirectory(crypto/ed25519-donna)
 
 set (UPNPC_BUILD_SHARED OFF CACHE BOOL "")

nano/core_test/CMakeLists.txt

@@ -26,6 +26,7 @@ add_executable (core_test
 	${rocksdb_test}
 	signing.cpp
 	socket.cpp
+	toml.cpp
 	timer.cpp
 	uint256_union.cpp
 	utility.cpp