Added french language (from English copy).

    For now, it's just a copy of the english.txt file.
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
add ability to change language
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'
Merge pull request #283 from fbourigault/feature-language-french

Add french language
add french language
Add new language files to vs project
Added missing inline sprites
Merge pull request #297 from duncanspumpkin/language_cleanup

Language cleanup