If the relative or absolute folder doesn't exist then FEX will search in the data folder for a rootFS named the same thing
If the path exists then it is used.
For example if my data folder contains `$HOME/.fex-emu/RootFS/Ubuntu_main/` and I set the RootFS option to `Ubuntu_main`
Then this rootfs will be used. Allows you to easily select a rootfs in that folder without having the full file path.
This commit does three things that are bounded to each other
1) Moves configs from ConfigValues.inl to Config.json
2) Uses the json to generate a man file with the options inside of it
3) Generates the code required for FEXLoader to automatically parse defined options
Moving the configuration options to a parseable format was required to generate the man pages.
Can't really include an inl file in the man page
Man page gets generated and installed through the regular cmake install process
`man FEX` to get the man page
With this change, FEXLoader's argument parsing now will automatically be generated from the json.
This way whatever is in the json file matches what is in the man page, in the json, AND what is returned in FEXLoader --help.
It will stay in sync now.
FEXConfig is the only application that stays out of sync for now as it requires some more thought to plan out.
A minor improvement that this brings as well is that every boolean option that has a long argument also gains the inversion of that property.
aka, `--gdb` also gains `--no-gdb` The use case for this is minor but boolean arguments should always allow negated variants.
Ryan Houdek