The previously supported WITH_BUNDLEDHEADERS option that affected which
ENet was being used has now been reversed and renamed to
USE_SYSTEM_ENET, which defaults to OFF for now.
FindIntl was added with CMake 3.2 and can be used to find the Gettext
libintl headers and libraries.
I've removed special handling of Solaris, which explicitly added linking
to 'intl' and added '/usr/local/lib' include path. It can be easily
restored if necessary, once somebody tries to compile Mana on Solaris.
CMake: Use add_compile_definitions instead of setting COMPILE_FLAGS
This is supported since CMake 3.12 (current minimum) and simplifies the
whole quoting business.
Also used a generator expression to set the DEBUG define conditionally.
At the same time, DEBUG is no longer defined in RelWithDebInfo builds,
but it shouldn't be.
Normally the popup follows the mouse, but when the mouse is moved down
such that it is on top of the popup, the popup would seem to get stuck.
When the BeingPopup is a mouse listener, the default behavior of Popup
hiding the BeingPopup when the mouse moves over them kicks in.
Hiding of the BeingPopup by Popup and Window when they are hovered in
general is a workaround which might be necessary because there is
currently no way for the Viewport to determine whether the mouse is
above the map view or over a piece of UI.
This SDL_GetMouseState call did not adjust the result to the graphics
scale. Fortunately it could just be removed, since mMouseX and mMouseY
are anyway updated each Viewport::logic.
