Use 7TV V3 API

[Nerixyz]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

This PR updates the 7TV resolver to use the V3 API since V2 is deprecated. This fixes an issue of emote-images not appearing because a static template was used. Furthermore, all public mentions of "SevenTV" have been replaced to "7TV".

[codecov]

Codecov Report

Merging #456 (742ab9b) into master (13079e1) will decrease coverage by 0.18%.
The diff coverage is 90.90%.

❗ Current head 742ab9b differs from pull request most recent head ca22975. Consider uploading reports for the commit ca22975 to get more accurate results

@@            Coverage Diff             @@
##           master     #456      +/-   ##
==========================================
- Coverage   45.64%   45.46%   -0.18%     
==========================================
  Files         103      103              
  Lines        3836     3818      -18     
==========================================
- Hits         1751     1736      -15     
+ Misses       2034     2032       -2     
+ Partials       51       50       -1     

Impacted Files	Coverage Δ
internal/resolvers/seventv/emote_loader.go	91.30% <90.62%> (+1.64%)	⬆️
internal/resolvers/seventv/initialize.go	100.00% <100.00%> (ø)

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[pajlada]

Small nitpicks of the initial review, will take a more proper check this week

I would like an emote test back of a global emote

[Nerixyz]

I would like an emote test back of a global emote

I added one. Though, note that "global emotes" are no different to regular emotes.

[pajlada]

Works as expected, thank you for the fix!