Lazy load

[aminya]

• Using Rollup and dynamic imports:
• I separated/refactored the part that checks if package-deps are installed from the part that installs the package-deps
• the whole check part is bundled into a single file and will be always loaded
• the install/prompt part is only loaded on demand.

Because many packages depend on package-deps, I think this optimization will benefit the whole Atom ecosystem.

This is tested and works as expected. It reduces the load time of a test package by 12ms (using require("atom-package-deps").install):
before

after

Small other changes:

• I did not change any of the helper codes. I just moved them to separate files.
• use files in package.json instead of putting every folder in npmignore
• renamed compile in scripts to debug

[aminya]

Any feedback on this? This is ready

[steelbrain]

Thank you for working on this, looks good, I'll review/merge this weekend

[aminya]

By targeting electron 5, package-deps is now even faster.

[aminya]

@steelbrain Any update on this? This is a small change. I just moved the code to different files, and I used dynamic import in the main file.

[steelbrain]

I'll review within the next 24 hours :)

[steelbrain]

Applied some touchups in #281

[aminya]

Awesome!