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.
Hmm... actually it is for loading modules for panels other than the root panel, so that we could improve the time required for loading the root panel.