overlays can prevent clicks from being handled by DF. likewise, vanilla
modal popups can prevent clicks from getting handled by DFHack. to
prevent a softlock, overlay will skip sending input to the overlay
widgets when a modal dialog is visible
loading other plugin modules during plugin_init results in those other
plugin modules not getting initialized properly. specifically, their
DFHACK_PLUGIN_LUA_FUNCTIONS and commands don't get added to their lua
module namespaces.
This reverts commit 5e845ec7983555a3577e583038da824902dbf477.
not compatible with our MSVC toolchain. we can revert this revert once
we update MSVC for the steam release
Myk Taylor