add support for custom xcode actions for bgfx.lua
add support for custom xcode actions for bgfx.lua

Since I am working on a custom genie action called "xcode7", this serve my purpose
mmicko/bgfx,elmindreda/bgfx,kondrak/bgfx,aonorin/bgfx,v3n/bgfx,MikePopoloski/bgfx,fluffyfreak/bgfx,jdryg/bgfx,jpcy/bgfx,cuavas/bgfx,bkaradzic/bgfx,attilaz/bgfx,jdryg/bgfx,andr3wmac/bgfx,darkimage/bgfx,jpcy/bgfx,jpcy/bgfx,kondrak/bgfx,LSBOSS/bgfx,v3n/bgfx,bkaradzic/bgfx,marco-we/bgfx,0-wiz-0/bgfx,mmicko/bgfx,aonorin/bgfx,attilaz/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,MikePopoloski/bgfx,bkaradzic/bgfx,v3n/bgfx,fluffyfreak/bgfx,Synxis/bgfx,emoon/bgfx,mendsley/bgfx,cuavas/bgfx,LWJGL-CI/bgfx,LSBOSS/bgfx,cuavas/bgfx,elmindreda/bgfx,marco-we/bgfx,mendsley/bgfx,andr3wmac/bgfx,marco-we/bgfx,attilaz/bgfx,jpcy/bgfx,jdryg/bgfx,MikePopoloski/bgfx,jdryg/bgfx,kondrak/bgfx,emoon/bgfx,andr3wmac/bgfx,mendsley/bgfx,0-wiz-0/bgfx,septag/bgfx,elmindreda/bgfx,LWJGL-CI/bgfx,darkimage/bgfx,emoon/bgfx,0-wiz-0/bgfx,fluffyfreak/bgfx,Synxis/bgfx,septag/bgfx,Synxis/bgfx,LWJGL-CI/bgfx,fluffyfreak/bgfx,mmicko/bgfx,aonorin/bgfx,LSBOSS/bgfx,darkimage/bgfx,septag/bgfx