Allow symbols to be compiled as enum literals when possible.

git-svn-id: https://ironscheme.svn.codeplex.com/svn@101489 2327b42d-5241-43d6-9e2a-de5ac946f064
Add record-constructor-descriptor?

git-svn-id: https://ironscheme.svn.codeplex.com/svn@101629 2327b42d-5241-43d6-9e2a-de5ac946f064
Add with-implicit

git-svn-id: https://ironscheme.svn.codeplex.com/svn@101630 2327b42d-5241-43d6-9e2a-de5ac946f064
Rename ExecutableTemplate.cs to Executable.cs.template.
Fixup references to it.

git-svn-id: https://ironscheme.svn.codeplex.com/svn@101718 2327b42d-5241-43d6-9e2a-de5ac946f064