Fix #167

[FWDekker]

Fixes #167.

• Adds the option to add a custom TableCellEditor to a Column in JCheckBoxTable.
• Uses IntelliJ's LocalPathCellEditor to edit paths with.
• Moves validation from the addDictionaries method to the doValidate method.
• Validates all dictionaries instead of only active dictionaries.
• Fixes an issue where an exception is thrown if a row that is being edited is removed.

[codecov]

Codecov Report

Merging #180 into master will increase coverage by 2.37%.
The diff coverage is 84.21%.

@@             Coverage Diff              @@
##             master     #180      +/-   ##
============================================
+ Coverage     72.75%   75.12%   +2.37%     
- Complexity      218      222       +4     
============================================
  Files            33       33              
  Lines           789      780       -9     
  Branches         80       81       +1     
============================================
+ Hits            574      586      +12     
+ Misses          199      177      -22     
- Partials         16       17       +1