Improvement for UI

[LeeMingDe]

What I did:
Fix the bug where label was not dynamic
Improved the UI a little
Added icons for RoomDetailsPanel
Remove Find Command ( for patients)

[codecov-io]

Codecov Report

Merging #100 into master will decrease coverage by 1.10%.
The diff coverage is 52.38%.

@@             Coverage Diff              @@
##             master     #100      +/-   ##
============================================
- Coverage     71.62%   70.52%   -1.11%     
+ Complexity      691      684       -7     
============================================
  Files           112      110       -2     
  Lines          2280     2317      +37     
  Branches        290      296       +6     
============================================
+ Hits           1633     1634       +1     
- Misses          544      576      +32     
- Partials        103      107       +4     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/seedu/address/commons/core/GuiSettings.java	69.23% <ø> (ø)	5.00 <0.00> (ø)
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...u/address/logic/commands/room/EditRoomCommand.java	80.00% <0.00%> (-1.16%)	16.00 <0.00> (ø)
...du/address/logic/commands/task/AddTaskCommand.java	52.94% <ø> (ø)	7.00 <0.00> (ø)
...address/logic/commands/task/DeleteTaskCommand.java	37.50% <ø> (ø)	7.00 <0.00> (ø)
...address/logic/commands/task/SearchTaskCommand.java	24.00% <0.00%> (ø)	5.00 <0.00> (ø)
.../seedu/address/logic/parser/CovigentAppParser.java	69.23% <0.00%> (-1.14%)	14.00 <0.00> (-1.00)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/main/java/seedu/address/ui/RoomCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/main/java/seedu/address/ui/RoomDetailsPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 13 more

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[w-yeehong]

Apart from a few nits, LGTM. I think maybe we can separate the changes into multiple PR next time? There seems to be a lot of different changes.