[LyX/master] Reduce the amount of needed boost headers

[Richard Kimberly Heck]

On 12/10/20 1:33 PM, Yuriy Skalko wrote:
>> The is not much to gain with is IMO, until we are ready to ditch 
>> boost. Note that, with all it problems, boost is highly portable and 
>> used by many people. So there is value in just using it and forget 
>> about possible problems.
>
> Yes, that was my plan ;) Now, with C++11 features, Boost is not so 
> indispensable. But really, getting rid of signals2 and lexical_cast 
> will be enough.

Since we already use Qt signals and slots, is there an option of using 
that in support/signals.h instead of boost? Or would that require moc, 
etc, in too many places?

Riki