Merge branch 'refactor-syntax_unicode_button' into refactor-syntax_unicode_setbuffer2
Remove MCParameter::setbuffer method

All calls to this method have been replaced with more modern equivalents.
Updates on srv multipart
Some more updates on methods at 'Extras' tab
Updates after Seb's feedback
Merge remote-tracking branch 'upstream/refactor-syntax_unicode' into refactor-syntax_unicode_SrvMultipart
Updated signature of cgi_get_upload_temp_dir()
Updates after Seb's feedback
Updated some methods that used GetEP
Updates after Seb's feedback #2
Merge remote-tracking branch 'upstream/refactor-syntax_unicode' into refactor-syntax_unicode_SrvMultipart
Merge remote-tracking branch 'origin/refactor-syntax_unicode_SrvMultipart' into refactor-syntax_unicode_SrvMultipart
Updates after Seb's feedback #3
Updates on GetEPs
Compiles on mobile, but a 'registration error' window pops up in the beginning
Updated some signatures so as to compile on Linux
Still does not compile on Linux
Change MC{Stack,Field,Card}::find to use a context instead of an EP
Updated MCS_resolvepath() signature so as to compile on Linux
Now it compiles on Linux