Add theme ids

[ForNeVeR]

This is supposed to fix #45.

Sadly, I don't understand how to build the plugin: it seems like it depends on some long gone dependencies from bintray :(

[ciscorucinski]

Yeah, it's a very old project. It will take a (long?) while for me to get it built myself. There are many things I don't like about how the project happened to evolve.

Right now the YouTrack issue has been updated to Major priority as many color schemes are logging similar errors. Given this, I will be monitoring this YouTrack issue as it seems to be fairly active now.

If adding id's is a new requirement, then it doesn't seem to be documented too well. Even when exporting color schemes to a plugin jar, there are no id's used either. Taking a quick look at newer color schemes (like VS Code Color Scheme), they don't use an id either for the color scheme itself. So I'm curious if adding an id for each color scheme would fix the issue or not.