Refactor project workflow and update dependencies

[arcticicestudio]

To match Arctic Ice Studio's workflow for all projects, the current setup will be refactored. This also includes updating all outdated dependencies and adding new packages.

Workflow Refactoring

• Retire Travis CI — As of Circle CI v2, the features like multi-stage builds and custom workflows are by far sufficient and doesn't require a second CI binding.
• Circle CI v2.1 — Update to the latest Circle CI version 2.1 for full compatibility and latest features.
• NPM scripts — Refactored all NPM scripts and added new commands to simplify and stabilize the project development process.

Dependency Updates

Update all outdated development dependencies:

• babel-eslint 8.2.5 ➜ 10.0.1
• del-cli 1.1.0 🆕
• eslint 4.19.1 ➜ 5.16.0
• eslint-config-arcticicestudio-base 0.3.0 ➜ >=0.1.0 <1.0.0
• eslint-plugin-import 2.13.0 ➜ 2.17.3
• eslint-plugin-json 1.2.0 ➜ 1.4.0
• eslint-plugin-prettier 2.6.1 ➜ 3.1.0
• npm-run-all 4.1.5 🆕
• prettier 1.13.7 ➜ 1.17.1
• remark-preset-lint-arcticicestudio >=0.1.0 <1.0.0
• vsce 1.62.0 🆕

NPM Scripts

New and refactored commands will be

• build — Creates a clean *.vsix project artifact using the vsce VS Code's official packaging tool.
• clean — Cleans the project root directory from previous builds and VSC ignored metadata files.
• format:pretty — Extracted from the main format command for a better modularity.
• package — Packages the project *.vsix artifact using the vsce VS Code's official packaging tool.