Configuration files for OAT

[Laupetin]

Currently there is no persistent configuration for Unlinker and only kind of "configuration" in form of .zone files for Linker.
The only way to set configuration is by specifying command line parameters.
Some configuration however is always set whenever a certain game or project is used like --search-path for Unlinker or --load for Linker.

To be able to easily setup projects without bat or sh scripts there should support for settings these properties in a file outside the command line.
These files should be have three types (lower overrides higher):

• Config that is always loaded (located relative to binary)
• Config that is loaded when a certain game is used (located relative to binary)
• Config that is loaded when a certain project is built (located relative to project)

My preference for configuration format is json.
This makes it possible to have a json schema in the repository for auto completion purposes.
Also no configuration property should be manditory to be able to just override ones that are different in each configuration.

In terms of location I'm thinking of the following values:

• Global config: ?bin?/config/config.json
• Game config: ?bin?/config/?game?.json
• Project config: From source search paths: config.json

If the global or game config file is missing, it should be initialized with the content of a json object only containing the $schema key pointing to the OAT repository json schema.