disable clang format in files in the standalone/ directories

[slava77]

this PR disables clang format in the standalone files.
This is somewhat temporary, until the migration and setup of the standalone builds inside cmssw repository is working.

This should let the cmssw tests PR going.

@makortel
please check and perhaps merge if the change looks reasonable

[makortel]

I sort of agree for the files that should eventually (before the PR into CMSSW gets merged) be removed (like from-root and nlohmann), but why not benefiting of consistent formatting for the standalone files that are intended to be kept? (not a big deal to me though)

[slava77]

I sort of agree for the files that should eventually (before the PR into CMSSW gets merged) be removed (like from-root and nlohmann), but why not benefiting of consistent formatting for the standalone files that are intended to be kept? (not a big deal to me though)

there is #71 to remind about it.
I was not sure if there will be also steps of further moving or updating files in the standalone to make them compile or do cross-checks with the mkFit/devel etc. So, the idea was to minimize the changes for now (to just one line), until it's clear what will happen with the code in the standalone/.

[slava77]

(not a big deal to me though)

I took the liberty to merge