Remove TSLint as an option

[Shinigami92]

What problem does this feature solve?

TSLint is now deprecated
#1021 (comment)

What does the proposed API look like?

• We should remove code associated with TSLint
• We should close all issues related to TSLint

[Shinigami92]

Query with all open TSLint issues and pull requests:
https://github.com/vuejs/vue-cli/issues?utf8=%E2%9C%93&q=is%3Aopen+tslint