Add application wide settings

[SamuelWei]

Fixes #34

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current masters head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Added package to save application wide settings in database
• Changed api route 'currentUser' to 'application' to place more data into it
• Adjust methods to work with the new api
• Make to logo read it's url from the config
• Add room limit

Other information

[codecov]

Codecov Report

Merging #36 into master will increase coverage by 0.28%.
The diff coverage is 82.50%.

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     65.76%   66.05%   +0.28%     
- Complexity      229      233       +4     
============================================
  Files            80       81       +1     
  Lines          1110     1137      +27     
  Branches         63       66       +3     
============================================
+ Hits            730      751      +21     
- Misses          363      369       +6     
  Partials         17       17              

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Middleware/Authenticate.php	100.00% <ø> (ø)	2.00 <0.00> (-2.00)
resources/js/views/App.vue	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../Http/Controllers/api/v1/ApplicationController.php	40.00% <40.00%> (ø)	2.00 <2.00> (?)
resources/js/store/modules/session.js	59.25% <60.00%> (+0.16%)	0.00 <0.00> (ø)
resources/js/components/Room/NewRoomComponent.vue	82.85% <80.00%> (+2.85%)	0.00 <0.00> (ø)
app/Http/Controllers/api/v1/RoomController.php	100.00% <100.00%> (ø)	19.00 <0.00> (+2.00)
...p/Http/Controllers/api/v1/auth/LoginController.php	100.00% <100.00%> (ø)	9.00 <0.00> (-1.00)
app/Http/Resources/User.php	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
app/User.php	100.00% <100.00%> (ø)	15.00 <3.00> (+3.00)
resources/js/store/index.js	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
... and 3 more

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