NoTaint UIDropDownMenu

v7.2.0.24015-r3 (2017/05/25)
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- Reverted LIB_UIDROPDOWNMENU_MAXBUTTONS back to 8
- Renamed ToC file name
- Added OptionalDeps: LibStub to ToC

v7.2.0.24015-r2 (2017/05/19)
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- added version number to EasyMenu
- increased LIB_UIDROPDOWNMENU_MAXBUTTONS to 24
- renamed packaged folder name to !NoTaint_UIDropDownMenu
  - No impact to addons which embedded this lib
  - For users who installed this lib separately, please remove the old "NoTaint_UIDropDownMenu" folder

v7.2.0.24015 (2017/05/12)
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- added UIDropDownMenu.xml;
- removed customized codes in creating buttons;
- removed customized codes in Lib_UIDropDownMenu_AddButton()
- added LibStub to set library's version