Flags to AddIntEditField() & Editor: warnings when trying to change values set in .editorconfig
* Add Flags to AddIntEditField()
* If charset, indent_style & indent_size are set in .editorconfig
added warnings (text now hardcore in code)
about the prohibition of change them in Editor by F8/Shift-F8, Ctrl-F5, Shift-F5
& disable them fields in local Editor settings by F9/Alt-Shift-F9
This PR explain situation #1592 for charset
and add simular behaivour for other .editorconfig parameters
after
6ff9f77
I'm not sure for good "????" in fileedit.cpp line 1131.
Please verify and may be correct message near "????" to more appropriate text.