Add MapSettingsManager and new mapgen setting script API functions

This commit refactors the majority of the Mapgen settings system.
- MapgenParams is now owned by MapSettingsManager, itself a part of ServerMap,
  instead of the EmergeManager.
- New Script API functions added:
    core.get_mapgen_setting
    core.get_mapgen_setting_noiseparams,
    core.set_mapgen_setting, and
    core.set_mapgen_setting_noiseparams.
- minetest.get/set_mapgen_params are deprecated by the above new functions.
- It is now possible to view and modify any arbitrary mapgen setting from a mod,
  rather than the base MapgenParams structure.
- MapgenSpecificParams has been removed.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/script/lua_api/l_mapgen.h b/src/script/lua_api/l_mapgen.h
index 9751c0db6..bb94575c7 100644
--- a/src/script/lua_api/l_mapgen.h
+++ b/src/script/lua_api/l_mapgen.h
@@ -40,6 +40,18 @@ private:
 	// set mapgen parameters
 	static int l_set_mapgen_params(lua_State *L);
 
+	// get_mapgen_setting(name)
+	static int l_get_mapgen_setting(lua_State *L);
+
+	// set_mapgen_setting(name, value, override_meta)
+	static int l_set_mapgen_setting(lua_State *L);
+
+	// get_mapgen_setting_noiseparams(name)
+	static int l_get_mapgen_setting_noiseparams(lua_State *L);
+
+	// set_mapgen_setting_noiseparams(name, value, override_meta)
+	static int l_set_mapgen_setting_noiseparams(lua_State *L);
+
 	// set_noiseparam_defaults(name, noiseparams, set_default)
 	static int l_set_noiseparams(lua_State *L);