Expand tree
Improved form tree
Made sections collapsable
Added error badge
Fixed CS
Vertically centered the icons in the form tree
Improved JavaScript of the form debugger
Inverted toggler images and improved button coloring
Added "use strict" statements
Changed toggle color back to blue and made headlines in the form debugger clickable
Moved toggle icon behind the headlines in the form debugger
Enlarged the clickable area of the toggle button in the form tree
Fixed asset function
Reverted new image
Reverted Sfjs.toggle change
feature #9857 Form Debugger JavaScript improvements (WouterJ)

This PR was submitted for the 2.4 branch but it was merged into the 2.5-dev branch instead (closes #9857).

Discussion
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Form Debugger JavaScript improvements

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | -
| Deprecations? | -
| Tests pass?   | -
| Fixed tickets | #9123
| License       | MIT
| Doc PR        | -

Commits
-------

406756d Reverted Sfjs.toggle change
226ac7c Reverted new image
53f164f Fixed asset function
c763d65 Merge pull request #1 from bschussek/issue9857
5afbaeb [WebProfilerBundle] Enlarged the clickable area of the toggle button in the form tree
58559d3 [WebProfilerBundle] Moved toggle icon behind the headlines in the form debugger
a0030b8 [WebProfilerBundle] Changed toggle color back to blue and made headlines in the form debugger clickable
505c5be [WebProfilerBundle] Added "use strict" statements
ebf13ed [WebProfilerBundle] Inverted toggler images and improved button coloring
07994d5 [WebProfilerBundle] Improved JavaScript of the form debugger
11bfda6 [WebProfilerBundle] Vertically centered the icons in the form tree
52b1620 Fixed CS
f21dab2 Added error badge
111a404 Made sections collapsable
60b0764 Improved form tree
0e03189 Expand tree