Use fonticons for embedded items in automate and catalogs

[skateman]

There were 3 places where PNGs were used:

• Editing a catalog bundle's resources
• Editing a schema of an automate class
• Editing the inputs of an builtin automate method

Parent issue: #4051

@miq-bot add_label gaprindashvili/no, graphics
@miq-bot add_reviewer @epwinchell

[miq-bot]

Checked commit skateman@5a3872d with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
3 files checked, 1 offense detected

**

• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby23, which recognizes
warning: 2.3.6-compliant syntax, but you are running 2.3.3.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.