Todometer Versions Save

They say that the best way to find bugs is to make a release. Here's the latest with some improvements:

• #77: This fixes notifications settings that were not saving properly
• #76 + #78: This allows for users to resume their tasks that they paused before
• #79: This adds the ability to see an example notification before enabling them

There are a LOT of changes here!

• Updates Electron
• Updates React
  • Switches to hooks
  • No more class components
• Removes Redux
• Updates application-building steps
• Updates app icon
• Makes the app responsive and resizable
• Reduces app size
• Removes moment and replaces it with date-fns
• Makes entire app keyboard-navigable
• Better Linux support (thanks to @The-Jonsey for this!)
• Adds reminder and reset notifications

Fixed a few bugs in the issue section, as well as added app version to the menu.

Bug list:

• #3 and #17: Turns out the mainWindow of the app was being called as the app started up, before it was defined in some cases. Added a fix to set a temporary value to the mainWindow until it's properly created.
• #15, #38, and #41: The app wasn't refreshing overnight if the computer went to sleep at some point during the day. Added a listener for the computer power to reload the clock when the computer wakes up.
• #45: Fixed part of this to allow fullscreen on all platforms. Need to do some further testing on Windows to rework the Hide function.

In this latest release we've launched todometer for Windows! There will be some OS-specific bugs, so issues are welcome. :)