This should fix rather common problem with mods, where two unrelated mods
accidentally use same file name for a config file, leading to very unclear
conflict since this result in a file override.
Now all config files referenced in mod.json are loaded specifically from
filesystem of mod that referenced it. In other words, it is no longer
possible for one mod to override config from another mod.
As a side effect, this allows mods to use shorter directory layout, e.g.
`config/modName/xxx.json` can now be safely replaced with `config/
xxx.json` without fear of broken mod if there is another mod with same
path to config. Similarly, now all mods can use `config/translation/
language.json` scheme for translation files
Since this is no longer a problem, I've also simplified directory layout
of our built-in 'vcmi' mod, by moving all files from `config/vcmi`
directory directly to `config` directory.
- Overrides for miscellaneous configs like mainmenu.json should works as
before
- Images / animations (png's or def's) work as before (and may still
result in confict)
- Rebalance mods work as before and can modify another mod via standard
`modName:objectName` syntax
