Conversion to standalone libraries

[erengy]

Similar to my effort in v1.2 to separate the anime video filename parser, I'm planning to continue modularizing Taiga in v1.3. This will not only result in a simpler codebase for Taiga, but it may benefit other projects as well (@erengy/anitomy is being used by at least three other applications).

• [x] Media detection: @erengy/anisthesia will take care of detecting running media players and web browsers, as well as retrieving information regarding the currently playing video (i.e. base/process.cpp, track/media.cpp, track/media_stream.cpp, data/media.xml). It's going to be Windows-only for a while, but the plan is to add Unix stuff too later on.
• [ ] Advanced Title Formatting: [WIP] @erengy/atf will replace our crude implementation that currently resides in taiga/script.cpp. It will fix some long-standing bugs and provide more features such as conditional sections and multi-line strings. The idea is that the application provides the necessary data for custom fields (e.g. %title%, %episode%), and the library takes care of everything else. We may eventually switch to a more advanced interpreted scripting language such as Lua, but not yet.
• [x] Semantic Versioning: I'll just move base/version.cpp to @erengy/semaver and write some tests for it.
• [x] Windows API: I'm moving win/* to its own repository at @erengy/windows. We're going to continue using this until v2.0, for the most part.
• [ ] libcurl wrapper: ~I'm currently evaluating @whoshuu/cpr as a replacement.~ If that doesn't work out, I may move my own interface (base/http.h and accompanying files) to a separate repository.

Third-party libraries

• [ ] boost: It has lots of things that should have been in the standard library. In particular, we could at least make use of algorithm, date_time, filesystem and optional headers. However, I'm leaning towards using my own code along with C++17 headers instead, to avoid bringing in a huge dependency.
• [x] date: We could possibly make use of this alongside <chrono>.
• [x] fmt: This seems to be a nice little library that we can use to format strings throughout the application.
• [x] json: I'm considering using this instead of JsonCpp.

Please let me know if you have any ideas or suggestions!

[wiiaboo]

Wasn't sure if this warranted a separate issue: Would it be possible to add something like https://github.com/stengerh/foo_tfsandbox?

[tomerghelber]

I would like to know why boost is "a huge dependency". Because there is a lot of code? We should be happy. Because its big? The compiler should be able to cut out the staff that aren't used. Thanks.