BuildInfo.BuildTime appears to cause sbt to always recompile BuildInfo to get
the latest time, which causes a recompile on any package that depends on
chisel3. This is quite painful for doing development on any Chisel projects.
BuildTime doesn't actually appear to be in use, and removing it fixes the
unnecessary recompilation issue.

Add runtime warnings for use of deprecated Chisel methods. This is done using a macro that takes the message from a `@deprecated` annotation, and adds a call to `Builder.deprecated`.

Reasoning is that by default, Scala doesn't print all deprecations, and that it's somewhat tricky to notice them - yet some support questions revolve around the use of deprecated and terribad API. This now prints warnings for uses of deprecated functions at runtime, and aggregates them by error and line to avoid spam. Also included is convenient information on enabling scalac deprecations.

This also changes how line numbers for Chisel's error facility is determined, using prefix string comparison of the stack trace element classnames, instead of checking if the class is a subtype of UserModule. The previous one (specifically, calls to Class.forName) seems to interact badly with reflection-based cloneType when called at scale. This should also give more accurate reporting of errors that are in user code but outside of a UserModule.

It turns out that `@deprecated` on macro functions don't do anything, so this changes the tags to the functions that the macros point to, which seems to work properly. It also turns out that there's a bunch of uses of deprecated functions in chiselTests which needs to be fixed.

Not all `@deprecated` functions are also annotated with `@chiselRuntimeDeprecation`, because they're still used in Chisel internals, and we can't track whether they're called by the user or by Chisel and it will give a misleading error. These are a small amount of functions.

Auto clone type 🦆

Also change Data.outerModule to Bundle._outerInst since it is only used
in autoclonetype. _outerInst is also Option[Object] instead of
Option[BaseModule] because the outer object could also be a Bundle.

Fixes #748

Fixes #746
Also add test for https://github.com/freechipsproject/firrtl/issues/705