Image Viewer: move info to status bar; resolve deprecation warnings across the add-on

[PrimozGodec]

Issue

There were few deprecation warning appearing in the addon. Image Viewer overrides self.info

Description of changes

• Resolve deprecation warnings
• Since info, in general, are moved to status bar elsewhere in Orange it is done here too.

Includes

• [X] Code changes
• [X] Tests
• [ ] Documentation

[codecov[bot]]

Codecov Report

Merging #174 into master will increase coverage by 4.37%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   61.61%   65.99%   +4.37%     
==========================================
  Files          13       13              
  Lines        3236     3238       +2     
  Branches      482      482              
==========================================
+ Hits         1994     2137     +143     
+ Misses       1118      967     -151     
- Partials      124      134      +10