clang-tidy: modernize-macro-to-enum

clang-tidy: modernize-macro-to-enum

- Fix warnings identified by this flag
- Remove the exclude from .clang-tidy file

Clang-tidy fix resulted in indentation dissimilar to that used so far.

This awk script was run on the .diff file:
/^+[A-Z]/  {
sub (/\+/,"+\t",$0)
print
next
}

$0 !~ /^+[A-Z]/  {
print
next
}

The following files were hand-edited:
thumb-standard.cc
ui-bookmark.cc