Remove pointless blank buttons

Originally committed to SVN as r6835.

aegisub/src/bitmaps/manifest.respack

@@ -28,9 +28,6 @@ button/attach_button_32.png
 button/automation_toolbutton_16.png
 button/automation_toolbutton_24.png
 button/automation_toolbutton_32.png
-button/blank_button_16.png
-button/blank_button_24.png
-button/blank_button_32.png
 button/bugtracker_button_16.png
 button/bugtracker_button_24.png
 button/bugtracker_button_32.png
@@ -157,9 +154,6 @@ button/delete_button_32.png
 button/detach_video_menu_16.png
 button/detach_video_menu_24.png
 button/detach_video_menu_32.png
-button/exit_button_16.png
-button/exit_button_24.png
-button/exit_button_32.png
 button/export_menu_16.png
 button/export_menu_24.png
 button/export_menu_32.png
@@ -220,9 +214,6 @@ button/new_toolbutton_32.png
 button/new_window_menu_16.png
 button/new_window_menu_24.png
 button/new_window_menu_32.png
-button/null_button_16.png
-button/null_button_24.png
-button/null_button_32.png
 button/open_audio_from_video_menu_16.png
 button/open_audio_from_video_menu_24.png
 button/open_audio_from_video_menu_32.png
@@ -253,9 +244,6 @@ button/override_aspect_menu_32.png
 button/paste_button_16.png
 button/paste_button_24.png
 button/paste_button_32.png
-button/paste_over_button_16.png
-button/paste_over_button_24.png
-button/paste_over_button_32.png
 button/properties_toolbutton_16.png
 button/properties_toolbutton_24.png
 button/properties_toolbutton_32.png

aegisub/src/command/icon.cpp

@@ -87,13 +87,11 @@ void icon_init() {
 INSERT_ICON("am/manager", automation_toolbutton)
 INSERT_ICON("am/meta", automation_toolbutton)
 INSERT_ICON("app/about", about_menu)
-INSERT_ICON("app/exit", exit_button)
 INSERT_ICON("app/language", languages_menu)
 INSERT_ICON("app/log", about_menu)
 INSERT_ICON("app/new_window", new_window_menu)
 INSERT_ICON("app/options", options_button)
 INSERT_ICON("app/toggle/global_hotkeys", toggle_audio_medusa)
-INSERT_ICON("app/updates", blank_button)
 INSERT_ICON("audio/close", close_audio_menu)
 INSERT_ICON("audio/commit", button_audio_commit)
 INSERT_ICON("audio/go_to", button_audio_goto)
@@ -115,15 +113,7 @@ INSERT_ICON("audio/stop", button_stop)
 INSERT_ICON("edit/line/copy", copy_button)
 INSERT_ICON("edit/line/cut", cut_button)
 INSERT_ICON("edit/line/delete", delete_button)
-INSERT_ICON("edit/line/duplicate", blank_button)
-INSERT_ICON("edit/line/duplicate/shift", blank_button)
-INSERT_ICON("edit/line/join/as_karaoke", blank_button)
-INSERT_ICON("edit/line/join/concatenate", blank_button)
-INSERT_ICON("edit/line/join/keep_first", blank_button)
 INSERT_ICON("edit/line/paste", paste_button)
-INSERT_ICON("edit/line/paste/over", paste_over_button)
-INSERT_ICON("edit/line/recombine", blank_button)
-INSERT_ICON("edit/line/split/by_karaoke", blank_button)
 INSERT_ICON("edit/line/swap", arrow_sort)
 INSERT_ICON("edit/redo", redo_button)
 INSERT_ICON("edit/search_replace", find_replace_menu)
@@ -142,10 +132,6 @@ INSERT_ICON("keyframe/save", save_keyframes_menu)
 INSERT_ICON("subtitle/attachment", attach_button)
 INSERT_ICON("subtitle/find", find_button)
 INSERT_ICON("subtitle/find/next", find_next_menu)
-INSERT_ICON("subtitle/insert/after", blank_button)
-INSERT_ICON("subtitle/insert/after/videotime", blank_button)
-INSERT_ICON("subtitle/insert/before", blank_button)
-INSERT_ICON("subtitle/insert/before/videotime", blank_button)
 INSERT_ICON("subtitle/new", new_toolbutton)
 INSERT_ICON("subtitle/open", open_toolbutton)
 INSERT_ICON("subtitle/open/charset", open_with_toolbutton)
@@ -154,8 +140,6 @@ INSERT_ICON("subtitle/save", save_toolbutton)
 INSERT_ICON("subtitle/save/as", save_as_toolbutton)
 INSERT_ICON("subtitle/select/visible", select_visible_button)
 INSERT_ICON("subtitle/spellcheck", spellcheck_toolbutton)
-INSERT_ICON("time/continous/end", blank_button)
-INSERT_ICON("time/continous/start", blank_button)
 INSERT_ICON("time/frame/current", shift_to_frame)
 INSERT_ICON("time/lead/in", button_leadin)
 INSERT_ICON("time/lead/out", button_leadout)
@@ -165,9 +149,6 @@ INSERT_ICON("time/shift", shift_times_toolbutton)
 INSERT_ICON("time/snap/end_video", subend_to_video)
 INSERT_ICON("time/snap/scene", snap_subs_to_scene)
 INSERT_ICON("time/snap/start_video", substart_to_video)
-INSERT_ICON("time/sort/end", blank_button)
-INSERT_ICON("time/sort/start", blank_button)
-INSERT_ICON("time/sort/style", blank_button)
 INSERT_ICON("timecode/close", close_timecodes_menu)
 INSERT_ICON("timecode/open", open_timecodes_menu)
 INSERT_ICON("timecode/save", save_timecodes_menu)