TWS: Add tws and untws tools

[Nostritius]

This PR adds wo TheWitcherSave related tools, for packing and unpacking TheWitcherSave files.

[DrMcCoy]

src/archives/util.cpp: In function ‘Common::UString Archives::findPath(const Common::UString&, Aurora::FileType, uint64, Common::HashAlgo)’:
src/archives/util.cpp:54:5: error: suggest explicit braces to avoid ambiguous ‘else’ [-Werror=dangling-else]
  if (!name.empty())
     ^

src/tws.cpp: In function ‘int main(int, char**)’:
src/tws.cpp:47:18: error: unused variable ‘game’ [-Werror=unused-variable]
   Aurora::GameID game = Aurora::kGameIDUnknown;
                  ^~~~

[DrMcCoy]

This breaks the unherf tool, because Sonic HERF files contain files with multiple extensions. Namely files compressed with the "small"-algorithm.

Like, for example, itm_ace_timmy_0.ncgr.small is now shown/extracted as itm_ace_timmy_0.ncgr, which is wrong.

[Nostritius]

Are .small files the only occasion where this happens? Becauseif so i would simply add a condition like

if (TypeMan.getFileType(name) == Aurora::kFileTypeNone || type == Aurora::kFileTypeSMALL)

[DrMcCoy]

Yeah, I don't want such a hacky solution :P

[Nostritius]

Does this mean, i should do this, or not?

[DrMcCoy]

No, you should not

[DrMcCoy]

Wait, why is that necessary to begin with?

File archives shouldn't carry an extension in their filenames.

I.e. the real, actual issue is that the TheWitcherSaveFile Archive class should strip extensions from the filenames, like we're doing with ZIP files, certain ERFs, NDS, HERFs, OBB, ... (see https://github.com/xoreos/xoreos/blob/master/src/aurora/zipfile.cpp#L61, https://github.com/xoreos/xoreos/blob/master/src/aurora/erffile.cpp#L600, https://github.com/xoreos/xoreos/blob/master/src/aurora/herffile.cpp#L133, https://github.com/xoreos/xoreos/blob/master/src/aurora/ndsrom.cpp#L92, https://github.com/xoreos/xoreos/blob/master/src/aurora/obbfile.cpp#L97)

[DrMcCoy]

And yes, I probably should have caught that earlier, sorry

[Nostritius]

I have now rewritten the file ending block in a (hopefully) more elegant way. I also fixed the other issues.

[Nostritius]

I have now switched the writing and reading to not directly use file types in the file names. I also fixed some other issues and modified the unit tests accordingly.

[DrMcCoy]

Merged as ed047ed...367563e, thanks! :)