Fix multiple issues

[JuliaPoo]

Fixes #187, Fixes #176, Fixes #172, Fixes #144
Fixes #148 (See point 5 below).

1. Error when charge does nothing.
2. Error when cca_delete tries to delete a CCA that does not exist.
3. Correct ChargeCommand.MESSAGE_USAGE.
4. Correct DeleteCcaCommand.MESSAGE_USAGE.
5. Added details to FilterCommand.MESSAGE_USAGE.
6. Correct OweCommand.MESSAGE_USAGE.
7. Fix parsing for OweCommand where multiple m/ were allowed but not handled.
8. Fix message for DeleteCcaCommand.
9. Fix AddCommand.MESSAGE_USAGE
10. Fix EditCommand.MESSAGE_USAGE
11. Fix AddCommand parsing multiple m/
12. Fix EditCommand parsing multiple m/

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 65.58%. Comparing base (834a24e) to head (2ce65bc).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...seedu/address/logic/commands/DeleteCcaCommand.java	0.00%	10 Missing ⚠️
...va/seedu/address/logic/commands/ChargeCommand.java	0.00%	7 Missing ⚠️
...u/address/logic/parser/DeleteCcaCommandParser.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #188      +/-   ##
============================================
- Coverage     66.06%   65.58%   -0.49%     
- Complexity      555      556       +1     
============================================
  Files            95       95              
  Lines          2163     2182      +19     
  Branches        219      217       -2     
============================================
+ Hits           1429     1431       +2     
- Misses          652      669      +17     
  Partials         82       82              

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