implement capitalized \defi* and \trefi

[kohlhase]

I have introduced

• \Defi, \Defii, \Defiii, \Defiv and \Defis, \Defiis, \Defiiis, \Defivs that capitalize their content in statements.sty.
• analogously \Mtrefi* in smultiling.dtx
• analogously \Indi* in omtext.dtx.

They need to be implemented in LaTeXML as well.

[kohlhase]

@tkw1536 if you show me how to capitalize in Perl, I can do that myself.

[tkw1536]

@kohlhase Note that I am not a perl expert, but a quick google search reveals multiple ways of doing it.

To capitalize a single word, you can use ucfirst:

print(ucfirst 'word'); # prints 'Word'

To capitalize all words in a sentence, you can use:

my $sentence = 'this is a sentence. ';
$sentence =~ s/(\w+)/\u$1/g;
print($sentence); # prints 'This Is A Sentence'

[kohlhase]

fixed on simplify branch