feat(eslint-plugin): add 'no-unnecessary-qualifier' rule

[uniqueiniquity]

Add equivalent rule to TSLint's no-unnecessary-qualifier.
This rule requires semantic information.

[codecov]

Codecov Report

Merging #231 into master will increase coverage by <.01%.
The diff coverage is 94.54%.

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
+ Coverage   94.53%   94.53%   +<.01%     
==========================================
  Files          62       63       +1     
  Lines        2706     2761      +55     
  Branches      701      718      +17     
==========================================
+ Hits         2558     2610      +52     
  Misses         57       57              
- Partials       91       94       +3

Impacted Files	Coverage Δ
...slint-plugin/src/rules/no-unnecessary-qualifier.ts	94.54% <94.54%> (ø)

[uniqueiniquity]

Regarding the diff coverage for the function i added to util.js, it only runs when used with TS 2.5. Do we have a way of testing that?

[armano2]

we are not supporting typescript 2.5

[uniqueiniquity]

@armano2 Ok, I can take out the back-compat parts.

[bradzacher]

Hey @uniqueiniquity, sorry for the pain, but we just merged a big PR to convert the plugin to typescript.
Please have a look through the source code and migrate your PR to typescript as well.
Let me know if you've got any questions!