Fix: Incorrect directory path if tool is installed by package #119
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Currently, if we install d1-graphics-tool with a .deb package, it will try to resolve the path to save a .json file to /usr/bin, since currently we save the configuration file wherever the binary is. User doesn't have an access to write to /usr/bin/ directly and this ends up with a problem in reading/writing to a config, resetting the config everytime app is being used.
This patch changes it, and leaves the configuration for the file to be saved in:
Also added missing documentation for config.cpp.