Fix gap in GUI when viewloan <index> is called

[marcus-ny]

Fixes #98

Changelog

• Implement an extra setting in Model to allow for dual panel view
• New variable isPersonTab added to Model. Since these BooleanProperties are becoming repetitive, we can refactor this by encapsulating all these tab properties into a single object in the coming interations

Note:

Seems to have fixed #106 as well (visually on the GUI). need confirming and testing. Likely will need more changes for this since the background list might still be populated when it shouldn't be.

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 46.76%. Comparing base (f504e9d) to head (64ab6f7).

Files	Patch %	Lines
src/main/java/seedu/address/ui/MainWindow.java	0.00%	19 Missing ⚠️
...rc/main/java/seedu/address/model/ModelManager.java	44.44%	9 Missing and 1 partial ⚠️
...rc/main/java/seedu/address/logic/LogicManager.java	0.00%	1 Missing ⚠️
.../seedu/address/logic/commands/ViewLoanCommand.java	0.00%	1 Missing ⚠️
...seedu/address/logic/commands/ViewLoansCommand.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #109      +/-   ##
============================================
- Coverage     47.11%   46.76%   -0.36%     
- Complexity      431      432       +1     
============================================
  Files            99       99              
  Lines          2235     2269      +34     
  Branches        224      227       +3     
============================================
+ Hits           1053     1061       +8     
- Misses         1138     1163      +25     
- Partials         44       45       +1     

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[Joseph31416]

lgtm!