This applies to "About Dialog", "Ban List Options Dialog", "Download From URL Dialog", "IP Subnet
Whitelist Options Dialog", "Search Plugin Select Dialog", "Search Plugin Source Dialog",
"Statistics Dialog", "Speed Limit Dialog" and "Torrent Options Dialog".
Also unifies storing the dialog size under the key "Size".
Explicit or implicit calls to begin() and end() cause a non-const
container to detach from shared data, ie. to perform a deep-copy to gain
a unique copy of the data.
That can be a expensive although unneeded operation.
In order to assist the developer a copyAsConst function is added.
copyAsConst returns a const copy of the object.
For lvalues just use qAsConst. It's only available on Qt 5.7.0. But we
added also for earlier versions. The developer can always use qAsConst.
Intended uses:
QString s = ...;
for (const auto &ch : qAsConst(s))
process(ch);
for (const auto &ch : copyAsConst(funcReturningQString()))
process(ch);
