Restructured intercom-common in preparation of a new "com_struct" attribute

[Fluxie]

"com_struct" attribute will be used to mark Rust structs that are accepted as parameters in COM interface methods.

[codecov-io]

Codecov Report

Merging #73 into master will increase coverage by 0.02%. The diff coverage is 89.36%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   74.53%   74.55%   +0.02%     
==========================================
  Files          56       61       +5     
  Lines        3436     3439       +3     
==========================================
+ Hits         2561     2564       +3     
  Misses        875      875

Impacted Files	Coverage Δ
intercom-common/src/attributes/com_library.rs	0% <ø> (ø)	:arrow_up:
intercom-common/src/model/common.rs	0% <0%> (ø)
intercom/src/error.rs	13.15% <0%> (ø)	:arrow_up:
intercom-common/src/builtin_model.rs	91.3% <100%> (ø)	:arrow_up:
intercom/src/combox.rs	84.93% <100%> (ø)	:arrow_up:
intercom-common/src/attributes/com_class.rs	100% <100%> (ø)	:arrow_up:
intercom-common/src/model/com_crate.rs	87.11% <87.11%> (ø)
intercom-common/src/model/com_impl.rs	90.56% <90.56%> (ø)
intercom-common/src/model/com_interface.rs	91.45% <91.45%> (ø)
intercom-common/src/model/com_class.rs	91.78% <91.78%> (ø)
... and 7 more

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[Rantanen]

Was this still pending the Built-in changes we discussed on IRC?

Removing the inject_built_in and injecting those automatically.

[Rantanen]

Syn 0.14 upgrade resulted in conflicts here.

The changes in model.rs should be mostly limited to

• Tokens -> TokenStream
• Ident -> &Ident
• Ident::from( str ) -> Ident::new( str, Span::call_site() )

The TokenStream, Span, etc. are easiest to use by including the use prelude::*. Given things like the TokenStream might change later when proc macros go stable and instead of proc_macro2::TokenStream we'll start using proc_macro::TokenStream, I figured defining these in a single place was more convenient.

[Rantanen]

Most of the changes from this MR were integrated into the type system MR. Thanks for those!

The one change that still remains is the com_struct <-> com_class name change.