* seal: Rework ext_transfer, ext_instantiate, ext_call error handling
* Deny calling plain accounts (must use transfer now)
* Return proper module error rather than ad-hoc strings
* Return the correct error codes from call,instantiate (documentation was wrong)
* Make ext_transfer fallible again to make it consistent with ext_call
* seal: Improve error messages on memory access failures
* seal: Convert contract trapped to module error
* seal: Add additional tests for transfer, call, instantiate
These tests verify that those functions return the error types
which are declared in its docs.
* Make it more pronounced that to_execution_result handles trap_reason
* Improve ReturnCode docs
* Fix whitespace issues in wat files
* Improve ReturnCode doc
* Improve ErrorOrigin doc and variant naming
* Improve docs on ExecResult and ExecError
* Encode u32 sentinel value as hex
* with_nested_context no longer accepts an Option for trie
* Fix successful typo
* Rename InvalidContractCalled to NotCallable
Alexander Theißen