Deleted most unused ace extensions

core/static/lib/ace/ext-beautify.js

core/static/lib/ace/ext-chromevox.js

core/static/lib/ace/ext-elastic_tabstops_lite.js

core/static/lib/ace/ext-emmet.js

core/static/lib/ace/ext-error_marker.js

core/static/lib/ace/ext-keybinding_menu.js

core/static/lib/ace/ext-language_tools.js

core/static/lib/ace/ext-linking.js

core/static/lib/ace/ext-modelist.js

core/static/lib/ace/ext-old_ie.js

core/static/lib/ace/ext-searchbox.js

core/static/lib/ace/ext-settings_menu.js

core/static/lib/ace/ext-spellcheck.js

core/static/lib/ace/ext-split.js

core/static/lib/ace/ext-static_highlight.js

core/static/lib/ace/ext-statusbar.js

core/static/lib/ace/ext-textarea.js

core/static/lib/ace/ext-themelist.js

core/static/lib/ace/ext-whitespace.js

core/static/lib/ace/snippets/abap.js