Added object_scenario_load_custom_text function
Added comments capability to language.txt. Now reads string number
Removed warnings. Only reads 4 characters for string id
Merge branch 'load_custom_text' of https://github.com/duncanspumpkin/OpenRCT2 into duncanspumpkin-load_custom_text

Conflicts:
	src/string_ids.c
Merge branch 'duncanspumpkin-load_custom_text'