Make subtitles files easily editable + make the textures loadable without overriding the game files

[justtoask]

Make the subtitle files with the English subtitles more easy to edit, for example change them to ini files with all the languages, like that:

[English]
dialogue_1=subtitle 1
dialogue_2=subtitle 2
[Spanish]
dialogue_1=subtitle 1
dialogue_2=subtitle 2

and allow for adding new translations, for example:

[English]
dialogue_1=subtitle 1
dialogue_2=subtitle 2
[Spanish]
dialogue_1=subtitle 1
dialogue_2=subtitle 2
[Polish]
dialogue_1=subtitle 1
dialogue_2=subtitle 2

and add an option for changing to these fan translations in the configuration menu. Also add an option to make the game load custom textures from the re_tweaks directory.