[Lazarus] New high DPI features in 1.7

[Ondrej Pokorny]

Hello,

I have worked on high DPI features recently.

If you want to play with high DPI support, follow this instruction: 
http://wiki.lazarus.freepascal.org/High_DPI#High_DPI_in_Lazarus_1.7_and_above

For Lazarus IDE itself: Recompile the IDE with LCLScaleForms compiler 
define before testing Lazarus IDE and reporting/fixing any layout bugs. 
After some time of testing LCLScaleForms will become default.

Ondrej