Cleaning up models and fixing JavaDoc comments

[codecov[bot]]

Codecov Report

Merging #49 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #49      +/-   ##
============================================
+ Coverage     86.57%   86.66%   +0.08%     
- Complexity      539      540       +1     
============================================
  Files            76       76              
  Lines          1274     1275       +1     
  Branches        191      191              
============================================
+ Hits           1103     1105       +2     
+ Misses          101      100       -1     
  Partials         70       70

Impacted Files	Coverage Δ	Complexity Δ
...ntime/backend/config/variables/ServerVariable.java	100% <ø> (ø)	3 <0> (ø)	:arrow_down:
...ackend/models/person/PersonCollisionException.java	100% <ø> (ø)	3 <0> (ø)	:arrow_down:
...m/vendingontime/backend/models/AbstractEntity.java	75% <ø> (ø)	11 <0> (ø)	:arrow_down:
...ntime/backend/models/location/MachineLocation.java	54.54% <ø> (ø)	5 <0> (ø)	:arrow_down:
...e/backend/models/bodymodels/person/SignUpData.java	71.42% <ø> (ø)	44 <0> (ø)	:arrow_down:
...ndingontime/backend/routes/ListMachinesRouter.java	100% <ø> (ø)	4 <0> (ø)	:arrow_down:
...gontime/backend/initializers/RouteInitializer.java	100% <ø> (ø)	3 <0> (ø)	:arrow_down:
...me/backend/models/bodymodels/person/LogInData.java	61.9% <ø> (ø)	10 <0> (ø)	:arrow_down:
.../vendingontime/backend/services/SignUpService.java	100% <ø> (ø)	6 <0> (ø)	:arrow_down:
...time/backend/services/AssignMaintainerService.java	95.23% <ø> (ø)	6 <0> (ø)	:arrow_down:
... and 58 more

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