EIntOverflow with 32 bit binary

[lainz]

        {$hints off}
        ec.red := (ec.red*($FFFF-gray)+level*gray) shr 16;
        ec.green := (ec.green*($FFFF-gray)+level*gray) shr 16;
        ec.blue := (ec.blue*($FFFF-gray)+level*gray) shr 16;
        {$hints on} 

Hi, this happens when I run LazPaint 'Debug' 32 bit, compiled with Lazarus Trunk and FPC Trunk. When compiled in 'Debug' 64 bit it works fine.

I don't know if is still a good idea to mantain 32 bit Windows, since only really old PC still uses 32 bit.

[lainz]

Some statistics (mainly gamers, but I think graphic editing should be the same)
https://store.steampowered.com/hwsurvey/

Also I have a Windows 10 VM with only 1.5 GB of RAM, so the myth that it requires at least 4 gb is not true. Of course is recommended, but not neccessary.

[circular17]

Oops it seems I missed this issue. I fixed it with on dev branch:

        {$hints off}
        ec.red := (ec.red*(not gray)+level*gray) shr 16;
        ec.green := (ec.green*(not gray)+level*gray) shr 16;
        ec.blue := (ec.blue*(not gray)+level*gray) shr 16;
        {$hints on}