build: fully transition away from cImport/addTranslateC

This migrates all remaining uses of cImport (and addTranslateC for good
measure) to using translate-c for C translation, ensuring that we are
ready for when cImport is removed from the language, and also that all
sources of C translation are using the same snapshot of the external
package (when can then be updated when we need to fix something).

A couple of notes:

* A few options have been added to support the new translations, namely
  the ability to link libraries (passed through to linkLibrary on the
  Translator side) and whether or not to initialize default values
  (looks like cImport did this without a way to control it, but
  translate-c does not do it by default).

* Using the new library linking option actually simplifies the process
  of translating a number of the C packages as we have been shipping the
  necessary headers for these packages already with the applicable
  libraries. For some of the more complex translation processes though,
  we still include the appropriate directories directly.

pkg/opengl/Program.zig

@@ -4,7 +4,7 @@ const std = @import("std");
 const assert = std.debug.assert;
 const log = std.log.scoped(.opengl);
 
-const c = @import("c");
+const c = @import("opengl_c");
 const Shader = @import("Shader.zig");
 const errors = @import("errors.zig");
 const glad = @import("glad.zig");