IntelliJ can understand that some annotations on fields mean that they
are implicitly initialized, which means we don't get the "field XXX is
not initialized" warning for `@LateInit` fields.
This setting, unfortunately, is recorded into `.idea/misc.xml`, which
contains a bunch of arbitrary stuff that we don't want to check into
source control
This adds some logic to touch up that file to mark `@LateInit` as
implicitly initialized fields, so we don't get any editor warnings.
Also, suppress some warnings.
Daniel Chao