Feat: Operations Functions for Metrics data source

[jacovinus]

Changelog:

Fixes:

• App Loader for first start.
• Fixed query direction switch functionality on request. The default direction now will be 'Backwards'.
• Added qryn-view version visible.
• One time picker for each query:
  • Now each query has it's own time picker
• Sync time ranges button:
  • A button to sync all time ranges with the time range of current query.

Features:

Operations for Metrics Data Source:

All the available metrics operations for the metrics form builder

• Aggregations for Metrics #286
• Range Functions for Metrics #285
• Functions for Metrics #287
• Trigonometric Functions for Metrics #288
• Time Functions for Metrics #289

Plugins:

An easy way to add components to various locations inside the app

• Plugins manager page (inside settings)
  • could activate or deactivate plugins
• Plugin locations:
  • Plugins could be easily added into a location inside view app.
• Plugins adding:
  • the plugins could be easily added into the app in a single page.

Raggix Plugin:

Requests preview

• Launch previews button
• squares representing each requests and clicking on a sample of its results
• Query preview
• Time range selector (for the requests sample)
• Send button to send to main Search component from datasource
• Recurrent requests
• Recurrent requests timerange selector

User Roles:

• User Roles Page
• Split Plugins Page
• New Menu (simplifyed) view
• Now features have access acording to User role
• User role could be taken from cookie
• Aggregation feature will only be available at an admin user

Referring issues:

• Take user role from cookie #335
• User roles feature #333
• Aggregation Widget #326

Completes milestone: User Roles feature