Add directory picker/#155

[baaraak]

Fix #155

• Add handlers file to register electron new event handlers (and initialize them in bacgkround.ts.
• Add custom setup config to CSV (we should use it also in the JSON exporter

[baruchiro]

We still have 2 "bugs"

1. The user can't enter filePath manually, so basically it's mean that he can't control the generated filename the default is 'transaction.csv' || 'transaction.json'.
   It's ok with you? Also, when the dialog is opened and the user selects a directory path, I get only the path and the file name 'transaction.csv' is removed.
   a. We can add the filename manually something like filePath = filePath + '/'transaction.csv''.
   b. We can do what I did in the start with the input + icon, then the user can select a path by clicking on the icon and using the dialog and editing it/change the filename.
   c. We can let the user choose 1 filename in a central place and all the exporter will use this file name

2. The json/csv component, I wrote it in here: https://github.com/brafdlog/hiuvi/pull/253/files#diff-e7af9e850b9bf9f5a4b28ef8b5abb00958fde041449aff6497aaeb2e2c40c504R75

Originally posted by @baaraak in #155 (comment)

[baruchiro]

1. About the concern with the folder/file name, I think you just need to use the showSaveDialog instead of showOpenDialog. Note the showSaveDialog is not actually saving something. It is just the right dialog for selecting a path to a new file, instead of selecting a path of existing one.
2. Not sure what you mean in the "json/csv component" "bug", maybe I answered you in my review...

Thanks! Good luck!!!!

[baruchiro]

@baaraak You can test the production version with the artifacts from here.

We will wait for @brafdlog if he wants to take a look, and I will merge it later.