config changes for zlux-editor to work

[wadkarsatish]

This PR addresses the issues below.

1. Remove unnecessary webpack module rules. As we are using '@ngtools/webpack' to build the angular contents so no need of 'ts-loader' and 'angular2-template-loader'.
2. The same goes with a rule for loading "html" files. The compilation will be done through '@ngtools/webpack' so no need to explicitly load the html templates.
3. desktop.ts added few more library references which is needed for plugins(zlux-editor, file manager)

[sakshibobade21]

Tested these changes, and everything works as expected. Thanks for the PR! Approving it.