Eliminate the C FFI; Namespace lib API and DeviceManager

We decided to get rid of the C FFI for libs. It was becoming too intricate
and complicated. It was becoming a technical burden and expanding into
too much extra code. It's unfortunate, but we'll have to give up on getting
out-of-tree hot-loadable libraries the easy way.

It's possible to still do it with cross compilation or by keeping track
of the libstdc++ version that the running harikoff binary was compiled
against. Then we can ensure that our loadable lib code is linked against
that same libstdc++ code and this should ensure ABI stability.

main.cpp

@@ -86,9 +86,9 @@ static int initializeHarikoff(int argc, char **argv, char **envp)
 		return EXIT_SUCCESS;
 	}
 
-	DeviceManager::getInstance().collateAllDeviceSpecs();
-	DeviceManager::getInstance().parseAllDeviceSpecs();
-	std::cout << DeviceManager::stringifyDeviceSpecs() << std::endl;
+	device::DeviceManager::getInstance().collateAllDeviceSpecs();
+	device::DeviceManager::getInstance().parseAllDeviceSpecs();
+	std::cout << device::DeviceManager::stringifyDeviceSpecs() << std::endl;
 	sense_api::SenseApiManager::getInstance().loadAllSenseApiLibsFromOptions();
 	std::cout << sense_api::SenseApiManager::getInstance().stringifyLibs()
 		<< std::endl;