Add preference to toggle blackout mode

Author: Bentroen

scripts/draw_window_preferences/draw_window_preferences.gml

@@ -90,6 +90,7 @@ if (selected_tab = 0) {
     if (draw_radiobox(x1 + 40, y1 + 164 + 16, theme == 0, "Aqua", "Use the aqua theme.")) {theme = 0 change_theme()}
 	if (draw_radiobox(x1 + 40, y1 + 164 + 16 + 20, theme == 2, "Dark", "Use the dark theme.")) {theme = 2 change_theme()}
     if (draw_radiobox(x1 + 40, y1 + 164 + 16 + 20 + 20, theme == 1, "90s", "Use the 90s theme.")) {theme = 1 change_theme()}
+	if (draw_checkbox(x1 + 40, y1 + 164 + 16 + 20 + 20 + 25, blackout, "Blackout mode", "Makes the workspace background solid black, so you can\nkey it out in your video editor when recording the screen.")) blackout = !blackout
     draw_areaheader(x1+258,y1+164,220,60,"Max frame rate (experimental)")
     if (draw_radiobox(x1+274,y1+164+16,!refreshrate,"30FPS","Run the program at 30FPS.")) {
         game_set_speed(30,gamespeed_fps)

scripts/load_settings/load_settings.gml

@@ -16,6 +16,7 @@ show_welcome =       ini_read_real(  "preferences", "show_welcome",       show_w
 autosave =           ini_read_real(  "preferences", "autosave",           autosave)
 autosavemins =       ini_read_real(  "preferences", "autosavemins",       autosavemins)
 theme =              ini_read_real(  "preferences", "theme",              theme)
+blackout =           ini_read_real(  "preferences", "blackout",           blackout)
 refreshrate =        ini_read_real(  "preferences", "refresh_rate",       refreshrate)
 songfolder =         ini_read_string("preferences", "song_folder",        songfolder)
 patternfolder =      ini_read_string("preferences", "pattern_folder",     patternfolder)

scripts/save_settings/save_settings.gml

@@ -15,6 +15,7 @@ ini_write_real_clean("preferences", "show_welcome",       show_welcome)
 ini_write_real_clean("preferences", "autosave",           autosave)
 ini_write_real_clean("preferences", "autosavemins",       autosavemins)
 ini_write_real_clean("preferences", "theme",              theme)
+ini_write_real_clean("preferences", "blackout",           blackout)
 ini_write_real_clean("preferences", "refresh_rate",       refreshrate)
 ini_write_string(    "preferences", "song_folder",        songfolder)
 ini_write_string(    "preferences", "pattern_folder",     patternfolder)