[Qt-creator] Use Gradle

[Jason H]

I asked this on the regular list but got no response. It's sort of a in-between issue.

For the most part, if I check out a project, I can compile it as-is. Unless it's a gradle project, in which case I get a bunch of errors, then realize oh, the Use Gradle check is not checked, I go in check it, it compiles.

We need a way for the gradle build process to be set on a per-project basis. Maybe we can add an option to the .pro?