Merge separate RGSS version build configs into one

Setup active RGSS version at runtime. Desired version can be
specified via config, or as default, auto detected from the game
files. This removes the need to build specifically for each
version, which should help packaging a lot.

This also greatly reduces the danger of introducing code that
wouldn't compile on all RGSS version paths (as certain code paths
were completely ifdef'd out).

This can be optimized more, eg. not compiling shaders that aren't
needed in the active version.

mkxp.pro

@@ -45,45 +45,11 @@ contains(BINDING, NULL) {
 	CONFIG += BINDING_NULL
 }
 
-# TODO: Use RGSS_VER macro instead of RGSSN in C++ sources
-isEmpty(RGSS_VER) {
-	RGSS_VER = 1
-}
-
-contains(RGSS_VER, 1) {
-	_HAVE_RGSS_VER = YES
-	DEFINES += "RGSS_VER=1"
-}
-
-contains(RGSS_VER, 2) {
-	contains(_HAVE_RGSS_VER, YES) {
-		error("Only one RGSS version may be selected")
-	}
-	_HAVE_RGSS_VER = YES
-
-	CONFIG += RGSS2
-	DEFINES += RGSS2 "RGSS_VER=2"
-}
-
-contains(RGSS_VER, 3) {
-	contains(_HAVE_RGSS_VER, YES) {
-		error("Only one RGSS version may be selected")
-	}
-	_HAVE_RGSS_VER = YES
-
-	CONFIG += RGSS2 RGSS3
-	DEFINES += RGSS2 RGSS3 "RGSS_VER=3"
-}
-
 unix {
 	CONFIG += link_pkgconfig
-	PKGCONFIG += sigc++-2.0 pixman-1 zlib physfs \
+	PKGCONFIG += sigc++-2.0 pixman-1 zlib physfs vorbisfile \
 	             sdl2 SDL2_image SDL2_ttf SDL_sound openal
 
-	RGSS2 {
-		PKGCONFIG += vorbisfile
-	}
-
 	MIDI {
 		PKGCONFIG += fluidsynth
 	}
@@ -166,7 +132,10 @@ HEADERS += \
 	src/aldatasource.h \
 	src/alstream.h \
 	src/audiostream.h \
-	src/rgssad.h
+	src/rgssad.h \
+	src/windowvx.h \
+	src/tilemapvx.h \
+	src/tileatlasvx.h
 
 SOURCES += \
 	src/main.cpp \
@@ -202,7 +171,12 @@ SOURCES += \
 	src/alstream.cpp \
 	src/audiostream.cpp \
 	src/rgssad.cpp \
-	src/bundledfont.cpp
+	src/bundledfont.cpp \
+	src/vorbissource.cpp \
+	src/windowvx.cpp \
+	src/tilemapvx.cpp \
+	src/tileatlasvx.cpp \
+	src/autotilesvx.cpp
 
 EMBED = \
 	shader/transSimple.frag \
@@ -219,28 +193,12 @@ EMBED = \
 	shader/simpleColor.vert \
 	shader/sprite.vert \
 	shader/tilemap.vert \
-	assets/liberation.ttf
-
-RGSS2 {
-	HEADERS += \
-	src/windowvx.h \
-	src/tilemapvx.h \
-	src/tileatlasvx.h
-
-	SOURCES += \
-	src/vorbissource.cpp \
-	src/windowvx.cpp \
-	src/tilemapvx.cpp \
-	src/tileatlasvx.cpp \
-	src/autotilesvx.cpp
-
-	EMBED += \
 	shader/blur.frag \
 	shader/blurH.vert \
 	shader/blurV.vert \
 	shader/simpleMatrix.vert \
-	shader/tilemapvx.vert
-}
+	shader/tilemapvx.vert \
+	assets/liberation.ttf
 
 MIDI {
 	HEADERS += \
@@ -352,13 +310,9 @@ BINDING_MRI {
 	binding-mri/tilemap-binding.cpp \
 	binding-mri/audio-binding.cpp \
 	binding-mri/module_rpg.cpp \
-	binding-mri/filesystem-binding.cpp
-
-	RGSS2 {
-		SOURCES += \
-		binding-mri/windowvx-binding.cpp \
-		binding-mri/tilemapvx-binding.cpp
-	}
+	binding-mri/filesystem-binding.cpp \
+	binding-mri/windowvx-binding.cpp \
+	binding-mri/tilemapvx-binding.cpp
 }
 
 OTHER_FILES += $$EMBED