Feature/cmjd 70 room schedule (more like "calendar refinement")

[Storyxx]

This branch adds all the features that the #126 branch was missing like:

• Searchable Events
• A calendar that displays all of the events
• CSS for calendar events
• Improved Icons - they are pixel art now to fit the size and make them less blurry

There are also a few refinements like:

• fixing the hack of including the slightly modified template files from the simple calendar gem into our project, with a very hacky line in app/views/rooms/calendar.html.erb
• fixing the tests as there are multiple incomparable time classes in rails and the devices randomly decide with which to parse a string... (in short, they didn't work on my machine)

[Storyxx]

Does anyone have an idea what to do about the too many lines problem from CodeFactor? Is there a possible refactor that would reduce this line-count? If so, please suggest a solution or simply push to this PR 😀

[codecov[bot]]

Codecov Report

Merging #263 (1821fc3) into dev (d2bfd54) will increase coverage by 0.75%. The diff coverage is 89.18%.

@@            Coverage Diff             @@
##              dev     #263      +/-   ##
==========================================
+ Coverage   97.93%   98.69%   +0.75%     
==========================================
  Files          35       36       +1     
  Lines         825      845      +20     
==========================================
+ Hits          808      834      +26     
+ Misses         17       11       -6     

Impacted Files	Coverage Δ
app/helpers/routing_helper.rb	100.00% <ø> (ø)
app/controllers/search_results_controller.rb	90.78% <83.33%> (+8.18%)	:arrow_up:
app/controllers/calendar_controller.rb	100.00% <100.00%> (ø)
app/models/event.rb	100.00% <100.00%> (ø)
app/models/search_result.rb	100.00% <100.00%> (+9.09%)	:arrow_up:

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