removed packages metadata

[sertonix]

This removes the metadata from the build script and the references in the code. This also removes the preload system for core packages.

The removed APIs are:

• packageJson._atomPackages
• packageJson._atomMenu
• AtomEnviroment.prototype.preload
• PackageManager.prototype.packagesCache
• PackageManager.prototype.preloadedPackages
• PackageManager.prototype.preloadPackages
• Package.prototype.preloadedPackage
• Package.prototype.preload
• Package.prototype.finishLoading
• ThemePackage.prototype.preload
• KeymapManager.prototype.canLoadBundledKeymapsFromMemory

And changes/disables these:

• KeymapManager.prototype.loadBundledKeymaps
• KeymapManager.prototype.onDidLoadBundledKeymaps
• KeymapManager.prototype.on('did-load-bundled-keymaps')

TODO:

• [ ] check if settings paths are influenced by this change
• [x] remove use from metadata settings-view

[Spiker985]

So, what did the preload system actually do?

Reading through the commits, it looks like it loaded certain packages before the editor window is actually loaded

[sertonix]

@Spiker985 Exactly. The core packages were partially loaded before the environment was initialized. This caused a lot of extra code for the core packages. It was most likely hood for the snapshot system but causes a lot of inconsistencies.

[sertonix]

I close this cause the changes to KeymapManager are not that correct. #154 is a continuation of this.