Add 4DForm as a JSON language

[Ganbin]

Description

4DForm extension contains JSON data representing 4D Form description. It is used in the context of 4D software application which start to provide source control compatibility in beta within the new v17 R6 version and will be released officially in v18 (between end 19 - begin 20). More and more repositories contains that kind of files.

Checklist:

• I am associating a language with a new file extension.
  • The new extension is used in hundreds of repositories on github.com
    • Search results for each extension:
      • https://github.com/search?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3A4DForm+pages+rightMargin+NOT+nothack
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • Example not on GitHub. It is a sample form that I have used during a training of 4D software development platform.
    • Sample license(s):
      • MIT
  • I have included a change to the heuristics to distinguish my language from others using the same extension.

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[pchaigno]

This shouldn't be necessary as you already added .4DForm as a JSON extension.

[Ganbin]

Ok I was not sure If I had to add it in the filename too.

[pchaigno]

@Alhadis Did you already check usage? Each repository seems to hold a lot of files.

[Alhadis]

Crap, you're right. There are only 28 repositories:

abachler/SchoolTrack-TNV
AchimPeschke/ap1
AchimPeschke/ap2
AJARProject/AJ_Tools_UnitTest
Anass093/myREP
august8/4d-version-test
ayoub-kl/4D_git_tuto
Demo4DSummit/4D-Library-Project
Demo4DSummit/testShareProject
Developer34D/4DLibrary
JeanL4D/4DPROJECT
minzirillo/JVFloatingLabel
miyako/4d-plugin-capture-with-preview
miyako/4d-plugin-input-scope
miyako/4d-plugin-tab-ui
miyako/4d-plugin-window-control-v2
robertbroussard/cms
robertbroussard/TimeBase
ThomasMaul/AdminWindow
ThomasMaul/Tools_TM
ThomasMaul/UserMode_Component
ttestd3/DWTestRep
vtalbot4D/4D-Library-Project
vtalbot4D/4DLibraryProject
vtalbot4D/testProject
Westworld/StrukturExport
Westworld/Video
wtaylor-4d/4D_FOR_IOS_DEMOS

Not nearly enough...

Derp

[pchaigno]

@Ganbin There isn't enough in-the-wild usage to support this extension yet, as per our contribution guidelines. Since there will be a first, non-beta release soon, we may expect usage to increase (?). In that case, I can add it to #4219 and monitor usage.

[Ganbin]

Hi, thanks for the interest and the check. Effectively, the non-beta (v18) should be released in early 2020. We could expect an increasing number of directories in the mid-2020. I also think that a lot of repositories may be private and are therefore not measurable.

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[pchaigno]

@Ganbin I usually check usage every ~6 months and stop monitoring file extensions for which usage hasn't grown. So it's maybe best if I start checking around the time the non-beta is released... Could you post here when that happens?

[Ganbin]

@pchaigno Ok I will try to remember to post here in about 6 month when the non-beta will be released.

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