Fixed gas integration (#265)

* Replace `get_` prefix in many getters

* Make imports ordering more consistent and use //! docs

* Improve documentation for RuntimePtr

* Unify impl blocks of Outcome

* Simplify Config initialization patterns

* Remove duplicated Call API (getters and pub attributes)

* Fix wrongly run doctest

* Move module documentation to the top

* Automatically derive Default for Program

* Remove blank lines between struct fields

* Replace utility macro with a function

* Draft the integration of gas metering

* Reorder some imports

* Remove too simple utility testing function

* Remove redundant Option for cycle examples

* Move module docs to top of files within runtime

* WIP

* Switch to thiserror

* Make TemplateHash a typedef, not a struct

* Add documentation

* WIP

* Check for svm_alloc when deploying a template

* Small change to comment

* Integrate svm_alloc checks before deployment

* Improve doc commenting style in svm-query

* deny some lints in svm-query

* Fix crate name in doc comment

* Reduce macro usage in runtime-ffi

* Add rustdoc links in context.rs

* Change some allow's into warn's and fix lint warnings

* WIP

* Fix typo in comment

* Unify address and app locator traits

* Rename 'compue_address.rs' file

* Refactor the new_store utility function

* Add price resolving draft to spawn_app

* Check ctor price before spawning an App

* Change the error type on invalid CTORs

* Add a pricing mechanism to the SVM runtime

* Fix failing test due to price resolver issue

* Add a global dependency to `thiserror`

* Make svm_alloc error detection more generic

* Wrap gas calculation utils in a module

* Refactor the opcode validation logic with an .all()

* Fix typo in comment

* Use a better name for struct field

* Reorder import- and export-related items in svm-gas

* Rename gas metering -related argument

* Rename the AddressLocator trait

* Remove unnecessary cast

* Use more consistent # Safety notices

* More descriptive test name

* Better local variable name

* Add intra-doc links in a doc comment

* Rename StandardPriceResolrver to V0PriceResolver

* Remove Clone bound from PriceResolver

* Better docs for Outcome

* Move local variable out of loop