Add experimental static optimization pass

This is not run by default, there is a target for it in the Makefile

This pass starts by loading all the church files that have changed since the last compile.

For each one it examines the exported method names and signatures.

From previous runs it also knows which files depend on methods defined in the changed files.

It builds a list of all files to recompile based on these dependencies.

During compilation it uses the knowledge of which files exported methods to be able to elide the dynamic dispatch step and instead create a direct call to the State function.

This currently only applies to methods which have all arguments of base type 'object'.

This is still fairly experimental and messy code. My tests so far show that the dispatch compiler already makes these optimizations somewhat redundant. If we can do type inference (and later control flow analysis across methods) then this type of optimization may become more powerful.