Header dependencies

[jimon]

In some cases I write something like build objects(build/**/*): auto src/**/*.c | src/**/*.h which have makes problems : every source file depends on every header file, so if you change a header file all source files are recompiled.

Would be nice to figure out how to depend on header so we can add them to the generated ide projects.

[jimon]

This is mostly needed for IDE project generation (CMake also requires you to add header files to target by yourself if you want them to end-up in ide project).

One idea - we can parse include dependencies from ninja itself, which should be awesome in a way, but kinda requires #154 and you need to build a project before you can generate ide project files ...

[den-mentiei]

Full recompile on any header change is even a bigger problem than IDE project generation

Shouldn't we just use deps feature of ninja? We can just build it once before generating the project and then parse it for header list.

[jimon]

If you write it like this build objects(build/**/*): auto src/**/*.c || src/**/*.h then it works just fine because we already are using ninja deps feature. The only thing - it's not that obvious.