(API Change) libobs: Add global module config path

API Changed:
---------------------------
From:
- bool obs_startup(const char *locale, profiler_name_store_t *store);

To:
- bool obs_startup(const char *locale, const char *module_config_path,
		profiler_name_store_t *store);

Summary:
---------------------------
This allows plugin modules to store plugin-specific configuration data
(rather than only allowing objects to store configuration data).  This
will be useful for things like caching data, for example looking up and
storing ingests from remote (rather than storing locally), or caching
font data (so it doesn't have to build a font cache each time), among
other things.

Also adds a module-specific directory for the UI

libobs/obs.h

@@ -241,10 +241,13 @@ struct obs_source_frame {
 /**
  * Initializes OBS
  *
- * @param  locale  The locale to use for modules
- * @param  store   The profiler name store for OBS to use or NULL
+ * @param  locale              The locale to use for modules
+ * @param  module_config_path  Path to module config storage directory
+ *                             (or NULL if none)
+ * @param  store               The profiler name store for OBS to use or NULL
  */
-EXPORT bool obs_startup(const char *locale, profiler_name_store_t *store);
+EXPORT bool obs_startup(const char *locale, const char *module_config_path,
+		profiler_name_store_t *store);
 
 /** Releases all data associated with OBS and terminates the OBS context */
 EXPORT void obs_shutdown(void);