Conflicts:
server/server_logic.cpp
Finally merging the changes to develop. This is only the ConfigUtility
skipping missing files, and something with the Timer class, that I'll need
to test the collisions.
If you have "config.next" set, the config system will load that as another
config file. Higher config files have a higher precedence over subfiles
when conflicting keys are encountered.
* Added singleton.hpp, containing Singleton<T>
* ConfigUtility now inherits from Singleton
* Tweaked timer.*pp layouts