Pack Windows application code into app.asar to improve startup and installation speed

[nanoant]

This is my first issue report for Typora. First of all let me thank you for such a marvelous piece of software.

I would like to suggest to pack C:\Program Files\Typora\resources\app into app.asar, same as it is done with electron.asar. I expect this will make installation and application startup much faster since windows IO for 3,108 Files, 442 Folders (taken from installation stats) is a pity, especially if some antivirus is running in background.

More info on the subject:

1. https://electronjs.org/docs/tutorial/application-distribution
2. How to disable packing into asar files? electron-userland/electron-builder#428

[abnerlee]

Packed some of it for quicker installation.