fix(filters): string <> should be Not Contains instead of Not Equal

[ghiscoding]

• prefixing a text search with <> should be equivalent to "Not Contains" instead of "Not Equal", we can keep the != as "Not Equal" so this way we have both available

[codecov]

Codecov Report

Merging #709 (2d0388e) into master (e24c6de) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #709   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10624     10626    +2     
  Branches      3755      3756    +1     
=========================================
+ Hits         10624     10626    +2     

Impacted Files	Coverage Δ
src/app/modules/angular-slickgrid/constants.ts	100.00% <ø> (ø)
...s/angular-slickgrid/filters/compoundInputFilter.ts	100.00% <ø> (ø)
...ickgrid/filter-conditions/stringFilterCondition.ts	100.00% <100.00%> (ø)

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