This reverts commit 0908aa7bb7.
It turns out there are multi-line text messages in use: Nebuleon found
one in the confirmation message when deleting a section.
When trying to test the previous commit, I couldn't find any place in
the application where strings containing newlines are drawn. So I'm
assuming this is an unnecessary feature, until someone comes up with
a test case proving otherwise.
Yeah, I'm too lazy to review all the code that draws text...
In well-described fonts, this enables multi-line text (e.g. in manuals) to be
more readable.
The term "height" is also replaced with "line spacing" in Font's code.
Replaced Font constructor with factory method, so that if the TTF
cannot be loaded, the Font object is not constructed. The normal C++
way of handling this is with exceptions, but we're compiling with
-fno-exceptions.
Originally the font implementation was based on SFont, but it was
recently replaced by an SDL_ttf based implementation, so the name
no longer made sense.
