add CLASS import key (refs #4096)

adapt check workflow

add attributeidentifiers namespace
use CLASS in core families (refs #4097)
integrate remarks (refs #4096)
add DocFile Class to migrate (refs #4096)
Merge pull request #923 from Eric-Brison/3.2-A4096

add CLASS import key (closes #4096) (closes #4097)
correct notice when no file yet (refs #3120)
correct strict notice in PU (refs #4120)
correct notice in import with no methods (refs #4120)
correct strict in wsh:fdl_sendmail usage due to pear mail (refs #4120)
correct strict in PU (refs #4120)
Merge pull request #922 from Eric-Brison/3.2-I4120

Correct somes strict and notice (closes #4120)
 migrate test (refs #4096)
Merge pull request #924 from Eric-Brison/3.2-A4096

adjust migrate  (fixes #4096)
Correct oooLayout bug with htmltext in array (refs #4130)
+ PU
Change ctrl name to Content and return error message when changing group (refs #4119)
Change width in table to style"width=" (refs #4107)
Delete squirel (refs #4111)
Merge pull request #926 from thingthing/3.2-I4130

Correct oooLayout bug with htmltext in array (closes #4130)
Merge pull request #929 from thingthing/3.2-I4111

Delete squirel (closes #4111)
Correct make clean + remove generated file updateclass (refs #4141)