Bug 1090843 - Improve the time required for being interactive

- Delay load the modules for loading hardware information required in the module of the root panel.
- Delay the use of query selectors in the init function of the root panel.
- Remove redundant setTimeouts in the panel navigation process.
- Some modules required in main.js are delay loaded.
`use strict` only takes affect in its function scope, so we need it for each function.