Now when something is unused it fails with a specific message about what it is, instead of just calling everything a "variable".

The types that can be reported are:
* function 🆕
* import 🆕
* parameter 🆕
* property 🆕
* variable

…d rules list (#1352)

Fixes #1269

Addresses #1323.

* Changed `Linter` to accept an optional program object in the constructor
  * Added helper functions for creating a program using a tsconfig and getting relevant files
* Created `TypedRule` class which receives the program object
  * Rules extending this class must implement `applyWithProgram`
  * `Linter` passes program to `TypedRule`s if available
  * Calling `apply` on a `TypedRule` throws an error
* Added `requiresTypeInfo` boolean to metadata
* Created `ProgramAwareRuleWalker` which walks with the program / typechecker
* Added cli options `--project` and `--type-check`
  * `--project` takes a `tsconfig.json` file
  * `--type-check` enables type checking and `TypedRule`s, requires `--project`
* Added an example `restrictPlusOperands` rule and tests that uses types

…prtly supports module targets (#1388)

* Add linterOptions to tslint.json

- only enable type checking during tests when typeCheck: true is configured
- fixes #1402

* Code style

* Add new Rule: arrow-parens

* Add test

* modify some documentations

* Core quote-props rule

* Tweaks for code review

* rename

…1349)

* Implement rule to forbid return statements in finally blocks #1097

* explore the try statement fully to pick up violations in nested scopes

* switch to a scope aware rule walker to reduce number of passes over the AST

* Add support for other control flow statements in finally blocks (break, continue, throws)

* improve the rationale description for the no unsafe finally rule

* rename rule to no-unsafe-finally to be inline with eslint

* add new rule to latest config

* pull out helper functions from the walker class.

* fix tslint violations (which didn't occur locally)

* task(formatter): added stylish formatter

* Support non-colors terminal in tests

* fix(stylish): lint quotes

* fix(stylish) 4 spaces indentation

* fix(stylish): correct strpad amount

* fix(stylish): test tuple position