Removed DHTMLXTREE code residue

Grepped the code for all DHTMLXTREE related occurrences. For e.g. -
1. node['id']
2. node['text']
3. node['im0'], node['im1'], node['im2']
4. node['item']
and deleted/addressed it.

#118
Clean up invalid ascii character sequences with ascii double quote and space.

Rubocop was reporting a fatal error:
  lib/util/win32/wim_parser.rb:1:1: F: "\xe2" on us-ascii.

To diagnose, I read each byte of the file, reporting any sequences outside the ascii range.

r = File.read("lib/util/win32/wim_parser.rb")
r.each_byte {|b| if b > 126; print "!!! #{b}"; else print b.chr; end;}; nil

The relevant characters and their surrounding context:
  "Value is set to !!! 226�!!! 156MSWIM\0\0!!! 226�!!! 157"

  "This flag is primarily used in the Windows!!! 194!!! 160Deployment Services (WDS) scenario"
Add missing post route for dashboard widget move

This is to fix the following error:

ActionController::RoutingError (No route matches [POST]
"/report/db_widget_dd_done")
...

https://bugzilla.redhat.com/show_bug.cgi?id=1167308
Charting: highlighter for pie charts.
Merge pull request #1119 from mzazrivec/fix_widget_move_routing

Add missing post route for dashboard widget move
Merge pull request #1120 from martinpovolny/pie_highlighter

Charting: highlighter for pie charts.
Added missing search related routes.

- Added missing routes to routes & specs tests.

https://bugzilla.redhat.com/show_bug.cgi?id=1168337
https://bugzilla.redhat.com/show_bug.cgi?id=1168336
Merge pull request #1128 from jrafanie/fix_fatal_error_xe2_on_us_ascii

Clean up invalid ascii character sequences with ascii double quote and space.
Merge pull request #1132 from h-kataria/added_missing_search_related_routes

Added missing search related routes.
Merge pull request #1102 from AparnaKarve/gh118_remove_dhtmlxtree_code_references

Removed DHTMLXTREE code residue
Add migration to add dynamic column to dialog_fields
Add dynamic related form fields in UI for DialogFieldRadioButtons
Enable automate calls from DialogFieldRadioButtons to populate values
Fix most Rubocop warnings
Save field values when dynamic flag is not set