Improve parsing of config paths #8
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Previously FPGS would try to append all other configuration paths to the root path, meaning that only the root path could be absolute, while the rest were forced to be relative. This change causes FPGS to clean, but not join, paths that are already absolute, so that absolute paths may be used in its configuration and on the command-line in addition to relative paths. Path manipulation is also simplified, as multiple redundant uses of `filepath.Abs()` + `path.Join()` were removed and replaced with `filepath.Join()` which handles standardizing path separators and otherwise cleaning paths to the same effect as the old method.
Uses the ServerSettings struct members as receivers for flag values directly instead of an intermediary variable, which cuts down on some of the boilerplate surrounding the loading of defaults via JSON and the processing of overrides via flags.
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Partially streamlines the routines for loading default values, overriding them with command-line flags, and normalizing them.
Additionally allows for the use of absolute paths aside from the root path to be used without issue.