ue4cli caches files inside of config directory

[sleeptightAnsiC]

This is just a little annoyance. Cache files should NOT be stored in config directory.
On Linux for example configs should be inside of ~/.config and cache inside of ~/.local or ~/.cache.
This rule is similar across all platforms pretty much.
Currently everything goes to the same config directory which is undesired:

ue4cli/ue4cli/CachedDataManager.py

Lines 36 to 38 in fed71c1

	@staticmethod
	def _cacheDir():
	return os.path.join(ConfigurationManager.getConfigDirectory(), 'cache')

Would be nice to fix this. Maybe not exactly for ue4cli but for its successor.