(Add) Empty Inbox button to the Private Message inbox

[clandestine8]

Created function & route to provide the option of deleting all items in your inbox at once.

Updated view to provide this feature to the end-user.

[clandestine8]

StyleCI wants me to break existing code which I didn't touch so I'm not going to do that

[codecov]

Codecov Report

Merging #1287 into master will increase coverage by 0.88%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1287      +/-   ##
============================================
+ Coverage     25.97%   26.86%   +0.88%     
- Complexity     4219     4220       +1     
============================================
  Files           300      300              
  Lines         13345    13350       +5     
============================================
+ Hits           3467     3586     +119     
+ Misses         9878     9764     -114     

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Controllers/PrivateMessageController.php	0.00% <0.00%> (ø)	29.00 <1.00> (+1.00)
app/Notifications/NewBon.php	0.00% <0.00%> (-100.00%)	3.00% <0.00%> (ø%)
app/Notifications/NewFollow.php	0.00% <0.00%> (-100.00%)	3.00% <0.00%> (ø%)
app/Models/BonTransactions.php	0.00% <0.00%> (-33.34%)	3.00% <0.00%> (ø%)
app/Services/MovieScrapper.php	61.11% <0.00%> (-22.23%)	10.00% <0.00%> (ø%)
app/Models/User.php	38.49% <0.00%> (-4.77%)	122.00% <0.00%> (ø%)
app/Http/Controllers/FollowController.php	74.07% <0.00%> (-3.71%)	7.00% <0.00%> (ø%)
app/Http/Controllers/BonusController.php	89.09% <0.00%> (ø)	52.00% <0.00%> (ø%)
app/Http/Controllers/CommentController.php	78.86% <0.00%> (+1.50%)	45.00% <0.00%> (ø%)
app/Repositories/ChatRepository.php	71.25% <0.00%> (+3.59%)	47.00% <0.00%> (ø%)
... and 10 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3235e6e...6ae99e9. Read the comment docs.