Isolate proc-macro dependency to the proc macro #77
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The dependency of askama on askama_shared on syn on proc_macro used to mean libproc_macro would be dynamically linked into any crate using askama. We want only askama_derive to have a runtime dependency on proc macro. This commit moves all proc macro code from askama_shared into askama_derive so that the askama crate no longer dynamically links libproc_macro.
Fixes #73. Closes dtolnay/syn#400.