Impl stack height limiter (#64)

* Initial implementation

* Add wasm-stack-height binary

* Fixes and tracing.

* Doc fixes.

* Fix type resolving for thunks.

* Fix thunk numbering.

* Don't generate thunks for fns with stack_cost = 0

* Diff tests.

* Add table tests.

* Add global test.

* Make tests deterministic.

* Refactoring.

* Clean and refactor.

* Rename Context → Stack in stach_height.

* Don't generate call wrappers if stack_cost = 0

* Errors instead of panics.

* Add with_stack_limit function.

* Fix thunk generation.

* Pass the stack height limit as separate value.

* Use .unwrap_or_default() in diff.rs.

* Remove redundant &.

* Remove simple_test.

* Remove variants of the Error.

* `resolve_func_type` returns an Error.

* Don't unwrap for .last()

* Remove stack_limit from rules::Set

* Rename max_height::compute.

src/lib.rs

@@ -18,6 +18,8 @@ mod ext;
 mod pack;
 mod runtime_type;
 
+pub mod stack_height;
+
 pub use optimizer::{optimize, Error as OptimizerError};
 pub use gas::inject_gas_counter;
 pub use logger::init_log;