Warn onexit about pending actions

[AWolf81]

Related Issue:

211

Summary:

• Added on close handling with IPC communication between mainWindow and renderer. Handled with channel appWillClose & triggerClose
• Created a pending task list to the modal that will be triggered if queue is not empty

Todos

• [x] Remove commented before-quit handler. Not needed anymore.
• [x] Add a \n beween the projects in the dialog message to have a better separation.

Things to discuss

• Copy text OK, or should we modify something? Also is the information reduction OK? Or should we show what's installing/uninstalling?
• As mentiond CreateProject build process can be closed with-out dialog. We need to tackle this later as this transition state is not tracked yet.
• Is there an easier way to handle the dialog on exit? The problem is that we need to stop the event in the main process. That's why everything I've added in renderer/component wasn't working.

Screenshots/GIFs:

[codecov[bot]]

Codecov Report

Merging #289 into master will increase coverage by 0.13%. The diff coverage is 24.24%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   20.09%   20.22%   +0.13%     
==========================================
  Files         235      235              
  Lines        3648     3653       +5     
  Branches      368      372       +4     
==========================================
+ Hits          733      739       +6     
+ Misses       2648     2644       -4     
- Partials      267      270       +3

Impacted Files	Coverage Δ
src/main.js	0% <0%> (ø)	:arrow_up:
src/components/Initialization/Initialization.js	33.33% <44.44%> (+33.33%)	:arrow_up:
src/sagas/delete-project.saga.js	96% <0%> (-0.16%)	:arrow_down:
src/reducers/dependencies.reducer.js	100% <0%> (ø)	:arrow_up:
src/reducers/onboarding-status.reducer.js	37.5% <0%> (+4.16%)	:arrow_up:
src/services/shell.service.js	30% <0%> (+30%)	:arrow_up: